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diff --git a/macros/latex/contrib/biblatex-contrib/biblatex-ieee/README.md b/macros/latex/contrib/biblatex-contrib/biblatex-ieee/README.md
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+biblatex-ieee - A biblatex implementation of the IEEE bibliography style
+========================================================================
+
+The `biblatex-ieee` package provides an implementation of the
+bibliography style of the IEEE for `biblatex`. This
+implementation follows standard `biblatex` conventions, and can
+be used simply by loading `biblatex` with the appropriate option
+
+    \usepackage[style=ieee]{biblatex}
+   
+A demonstration database is provided to show how to format input
+for the style.
+
+The `biblatex-ieee` style requires `biblatex` 3.8 or later, and
+works with both BibTeX and Biber as the database back-end.
diff --git a/macros/latex/contrib/biblatex-contrib/biblatex-ieee/biblatex-ieee-alphabetic.pdf b/macros/latex/contrib/biblatex-contrib/biblatex-ieee/biblatex-ieee-alphabetic.pdf
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--- /dev/null
+++ b/macros/latex/contrib/biblatex-contrib/biblatex-ieee/biblatex-ieee-alphabetic.pdf
diff --git a/macros/latex/contrib/biblatex-contrib/biblatex-ieee/biblatex-ieee-alphabetic.tex b/macros/latex/contrib/biblatex-contrib/biblatex-ieee/biblatex-ieee-alphabetic.tex
new file mode 100644
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--- /dev/null
+++ b/macros/latex/contrib/biblatex-contrib/biblatex-ieee/biblatex-ieee-alphabetic.tex
@@ -0,0 +1,82 @@
+%% ---------------------------------------------------------------
+%% biblatex-ieee --- A biblatex implementation of the IEEE 
+%%   bibliography style
+%% Maintained by Joseph Wright
+%% E-mail: joseph.wright@morningstar2.co.uk
+%% Released under the LaTeX Project Public License v1.3c or later
+%% See http://www.latex-project.org/lppl.txt
+%% ---------------------------------------------------------------
+%% 
+
+\documentclass[a4paper]{ltxdoc}
+\usepackage{lmodern}
+\usepackage[T1]{fontenc}
+\usepackage[style=ieee-alphabetic,backend=biber]{biblatex}
+\usepackage[final]{microtype}
+\usepackage{csquotes}
+\usepackage{hyperref}
+
+\hypersetup{hidelinks}
+
+\addbibresource{biblatex-ieee.bib}
+
+\author{Joseph Wright\thanks{E-mail: 
+  \href{mailto:joseph.wright@morningstar2.co.uk}
+  {\texttt{joseph.wright@morningstar2.co.uk}}}}
+\title{The \pkg{ieee-alphabetic} bibliography style for \pkg{biblatex}%
+  \footnote{This file describes v1.3a, last revised 2019/06/19.}}
+\date{Released 2019/06/19}
+
+\providecommand*{\pkg}[1]{\textsf{#1}}
+
+\RecordChanges
+
+\begin{document}
+
+\maketitle
+
+This package provides a style for \pkg{biblatex} which follows the
+guidelines of the \textsc{ieee} but using alphabetic labels. The citation
+style is alphabetic and sorted by alphabetic label, title and year.
+The bibliography style follows the pattern of the official \pkg{IEEEtran}
+package (\url{http://www.ieee.org/documents/stylemanual.pdf}). The style
+should be loaded in the usual way
+\begin{verbatim}
+  \usepackage[style=ieee-alphabetic]{biblatex}
+\end{verbatim}
+The References section of this document demonstrates the format 
+generated by the package using the \texttt{biblatex-ieee.bib} database
+of example citations.
+
+\nocite{*}
+
+\printbibliography
+
+\end{document}
+
+%% 
+%% Copyright (C) 2011-2013,2015-2018 by
+%%   Joseph Wright <joseph.wright@morningstar2.co.uk>
+%% 
+%% It may be distributed and/or modified under the conditions of
+%% the LaTeX Project Public License (LPPL), either version 1.3c of
+%% this license or (at your option) any later version.  The latest
+%% version of this license is in the file:
+%% 
+%%    http://www.latex-project.org/lppl.txt
+%% 
+%% This work is "maintained" (as per LPPL maintenance status) by
+%%   Joseph Wright.
+%% 
+%% This work consists of the files biblatex-ieee.bib,
+%%                                 biblatex-ieee.tex,
+%%                                 ieee.bbx,
+%%                                 ieee.cbx,
+%%                                 ieee-alphabetic.bbx,
+%%                                 ieee-alphabetic.cbx and
+%%                                 magyar-ieee.lbx,
+%%           and the derived files biblatex-ieee.pdf and
+%%                                 biblatex-ieee-alphabetic.pdf.
+%% 
+%%
+%% End of file `biblatex-ieee.tex'.
diff --git a/macros/latex/contrib/biblatex-contrib/biblatex-ieee/biblatex-ieee.bib b/macros/latex/contrib/biblatex-contrib/biblatex-ieee/biblatex-ieee.bib
new file mode 100644
index 0000000000..f7aca337c7
--- /dev/null
+++ b/macros/latex/contrib/biblatex-contrib/biblatex-ieee/biblatex-ieee.bib
@@ -0,0 +1,413 @@
+%% ---------------------------------------------------------------
+%% biblatex-ieee --- A biblatex implementation of the IEEE 
+%%   bibliography style
+%% Maintained by Joseph Wright
+%% E-mail: joseph.wright at morningstar2.co.uk
+%% Released under the LaTeX Project Public License v1.3c or later
+%% See http://www.latex-project.org/lppl.txt
+%% ---------------------------------------------------------------
+%% 
+
+% The example here are all taken from "IEEEexample.bib", part of the
+% IEEEttran bundle which provides official support for IEEE journals.
+% The entries have been modified to follow the conventions introduced
+% by biblatex. The keys have been retained to allow direct comparison
+% of the two approaches.
+
+@inbook{IEEEexample:incollectionwithseries,
+  author        = "J. B. Anderson and K. Tepe",
+  title         = "Properties of the Tailbiting {BCJR} Decoder",
+  booktitle     = "Codes, Systems and Graphical Models",
+  series        = "{IMA} Volumes in Mathematics and Its Applications",
+  publisher     = "Springer-Verlag",
+  location      = "New York",
+  year          = "2000"  
+}
+
+@book{IEEEexample:inbookpagesnote,
+  author        = "B. K. Bul",
+  title         = "Theory Principles and Design of Magnetic Circuits",
+  publisher     = "Energia Press",
+  location      = "Moscow",
+  year          = "1964",
+  pages         = "464",
+  note          = "(in Russian)"
+}
+
+@book{IEEEexample:bookwitheditor,
+  editor        = "J. C. Candy and G. C. Temes",
+  title         = "Oversampling Delta-Sigma Data Converters Theory,
+                   Design and Simulation",
+  publisher     = "{IEEE} Press.",
+  location      = "New York",
+  year          = "1992"
+}
+
+@book{IEEEexample:bookwithseriesvolume,
+  editor        = "J. Breckling",
+  title         = "The Analysis of Directional Time Series: Applications to
+                   Wind Speed and Direction",
+  series        = "Lecture Notes in Statistics",
+  publisher     = "Springer",
+  address       = "Berlin, Germany",
+  year          = "1989",
+  volume        = "61"
+}
+
+@article{IEEEexample:articlelargepages,
+  author        = "A. Castaldini and A. Cavallini and B. Fraboni
+                   and P. Fernandez and J. Piqueras",
+  title         = "Midgap Traps Related to Compensation Processes in
+                   {CdTe} Alloys",
+  journaltitle  = "Phys. Rev. B.",
+  volume        = "56",
+  number        = "23",
+  year          = "1997",
+  pages         = "14897-14900"
+}
+
+@article{IEEEexample:TBPmisc,
+  author        = "M. Coates and A. Hero and R. Nowak and B. Yu",
+  title         = "Internet Tomography",
+  journaltitle  = "IEEE J. Selected Areas Commun.",
+  month         = 05,
+  year          = "2002",
+  note          = "to be published"
+}
+
+@book{IEEEexample:book_typical,
+  author        = "B. D. Cullity",
+  title         = "Introduction to Magnetic Materials",
+  publisher     = "Addison--Wesley",
+  location      = "Reading, MA",
+  year          = "1972"
+}
+
+@inbook{IEEEexample:incollectionmanyauthors,
+  author        = "R. M. A. Dawson and Z. Shen and D. A. Furst and
+                   S. Connor and J. Hsu and M. G. Kane and R. G. Stewart and
+                   A. Ipri and C. N. King and P. J. Green and R. T. Flegal
+                   and S. Pearson and W. A. Barrow and E. Dickey and K. Ping
+                   and C. W. Tang and S. Van. Slyke and
+                   F. Chen and J. Shi and J. C. Sturm and M. H. Lu",
+  title         = "Design of an Improved Pixel for a Polysilicon 
+                   Active-Matrix Organic {LED} Display",
+  booktitle     = "{SID} Tech. Dig.",
+  volume        = "29",
+  year          = "1998",
+  pages         = "11-14"
+}
+
+@inbook{IEEEexample:repeatedauthorone,
+  author    = "W. Dai and H. V. Pham and O. Milenkovic",
+  title     = "Distortion-rate functions for quantized compressive sensing",
+  booktitle =
+    "IEEE Information Theory Workshop on Networking and Information Theory",
+  year      = "2009"
+}
+
+@inbook{IEEEexample:repeatedauthortwo,
+  author    = "W. Dai and H. V. Pham and O. Milenkovic",
+  title     = "comparative study of quantized compressive sensing schemes",
+  booktitle = 
+    "IEEE Information Theory Workshop on Networking and Information Theory",
+  year      = "2009"
+}
+
+@inproceedings{IEEEexample:presentedatconf,
+  author        = "S. G. Finn and M. M{\'e}dard and R. A. Barry",
+  title         = "A Novel Approach to Automatic Protection Switching
+                   Using Trees",
+  eventtitle    = "{IEEE} International Conference on Communications",
+  location      = "Montreal, Que., Canada",
+  year          = "1997"
+}
+
+@manual{IEEEexample:motmanual,
+  title         = "{FLEXChip} Signal Processor ({MC68175/D})",
+  organization  = "Motorola",
+  year          = "1996"
+}
+
+@inbook{IEEEexample:incollection_chpp,
+  author        = "P. Hedelin and P. Knagenhjelm and M. Skoglund",
+  editor        = "W. B. Kleijn and K. K. Paliwal",
+  title         = "Theory for Transmission of Vector Quantization Data",
+  booktitle     = "Speech Coding and Synthesis",
+  publisher     = "Elsevier Science",
+  location      = "Amsterdam, The Netherlands",
+  year          = "1995",
+  chapter       = "10",
+  pages         = "347-396"
+}
+
+@patent{IEEEexample:jppat,
+  author        = "U. Hideki",
+  title         = "Quadrature Modulation Circuit",
+  type          = "patentjp",
+  number        = "152932/92",
+  year          = "1992-05-20"
+}
+
+@periodical{IEEEexample:periodical,
+  title         = "IEEE Personal Commun. Mag., Special Issue on 
+                  Wireless {ATM}",
+  volume        = "3",
+  year          = "1996-08",
+}
+
+@misc{IEEEexample:standard,
+  title         = "Wireless {LAN} Medium Access Control {(MAC)} and 
+                   Physical Layer {(PHY)} Specification",
+  howpublished  = "{IEEE} Std. 802.11",
+  year          = "1997"
+}
+
+@online{IEEEexample:electronhowinfo,
+  author        = "V. Jacobson",
+  title         = "Modified {TCP} Congestion Avoidance Algorithm",
+  howpublished  = "end2end-interest mailing list",
+  url           = "ftp://ftp.isi.edu/end2end/end2end-interest-1990.mail",
+  year          = "1990-04"
+}
+
+
+@report{IEEEexample:techrep,
+  author        = "R. Jain and K. K. Ramakrishnan and D. M. Chiu",
+  title         = "Congestion Avoidance in Computer Networks with a 
+                   Connectionless Network Layer",
+  institution   = "Digital Equipment Corporation",
+  location      = "MA",
+  number        = "DEC-TR-506",
+  year          = "1987-08",
+  type          = "techreport"
+}
+
+@article{IEEEexample:TBParticle,
+  author        = "N. Kahale and R. Urbanke",
+  title         = "On the Minimum Distance of Parallel and Serially
+                   Concatenated Codes",
+  journaltitle  = "IEEE Trans. Inf. Theory",
+  note          = "submitted for publication"
+}
+
+@report{IEEEexample:techrepstdsub,
+  author        = "S. Kandala",
+  title         = "Changes to {A}nnex {D}",
+  institution   = "{IEEE} 802.11 {TGe}",
+  number        = "02/680r0",
+  year          = "2002-10",
+  type          = "techreport"
+}
+
+@thesis{IEEEexample:masterstype,
+  author        = "A. Karnik",
+  title         = "Performance of {TCP} Congestion Control with Rate
+                   Feedback: {TCP/ABR} and Rate Adaptive {TCP/IP}",
+  institution   = "Indian Institute of Science",
+  type          = "M. Eng. thesis",
+  location      = "Bangalore, India",
+  year          = "1999-01"
+}
+
+@patent{IEEEexample:frenchpatreq,
+  author        = "F. Kowalik and M. Isard",
+  title         = "Estimateur d'un D{\'e}faut de Fonctionnement 
+                   d'un Modulateur en Quadrature et {\'E}tage de Modulation
+                   l'Utilisant",
+  language      = "french",
+  type          = "French Patent Request",
+  number        = "9500261",
+  year          = "1995-01-11"
+}
+
+@thesis{IEEEexample:phdurl,
+  author        = "Q. Li",
+  title         = "Delay Characterization and Performance Control of
+                   Wide-area Networks",
+  institution   = "Univ. of Delaware",
+  location      = "Newark, NJ",
+  type          = "phdthesis",
+  year          = "2000-05",
+  url           = "http://www.ece.udel.edu/~qli"
+}
+
+@thesis{IEEEexample:masters,
+  author        = "Nin C. Loh",
+  title         = "High-Resolution Micromachined Interferometric
+                   Accelerometer",
+  institution   = "Massachusetts Institute of Technology",
+  location      = "Cambridge, MA",
+  type          = "mathesis",
+  year          = "1992"
+}
+
+@online{IEEEexample:electronorgadd,
+  author        = "D. H. Lorenz and A. Orda",
+  title         = "Optimal Partition of {QoS} Requirements on Unicast
+                   Paths and Multicast Trees",
+  institution   = "Dept. Elect. Eng., Technion",
+  location      = "Haifa, Israel",
+  url           = "ftp://ftp.technion.ac.il/pub/supported/ee/Network/lor.mopq98.ps",
+  year          = "1998-07"
+}
+
+@book{IEEEexample:book,
+  author        = "S. M. Metev and V. P. Veiko",
+  editor        = "Osgood, Jr., R. M.",
+  title         = "Laser Assisted Microtechnology",
+  edition       = "2",
+  publisher     = "Springer-Verlag",
+  location      = "Berlin, Germany",
+  year          = "1998"
+}
+
+@report{IEEEexample:techreptypeii,
+  author        = "D. Middleton and A. D. Spaulding",
+  title         = "A Tutorial Review of Elements of Weak Signal Detection
+                   in Non-{G}aussian {EMI} Environments",
+  institution   = "National Telecommunications and Information
+                   Administration ({NTIA}), U.S. Dept. of Commerce",
+  type          = "NTIA Report",
+  number        = "86-194",
+  year          = "1986-05"
+}
+
+@inproceedings{IEEEexample:confwithpapertype,
+  author        = "B. Mikkelsen and G. Raybon and R.-J. Essiambre and
+                   K. Dreyer and Y. Su. and L. E. Nelson and J. E. Johnson
+                   and G. Shtengel and A. Bond and D. G. Moodie and
+                   A. D. Ellis",
+  title         = "160 {Gbit/s} Single-channel Transmission Over 300 km 
+                   Nonzero-dispersion Fiber With Semiconductor Based
+                   Transmitter and Demultiplexer",
+  booktitle     = "Proc. {ECOC}'99",
+  location      = "Nice, France",
+  year          = "1999",
+  pages         = "28-29"
+}
+
+@article{IEEEexample:articledualmonths,
+  author        = "Y. Okada and K. Dejima and T. Ohishi",
+  title         = "Analysis and Comparison of {PM} Synchronous Motor and
+                   Induction Motor Type Magnetic Bearings",
+  journaltitle  = "IEEE Trans. Ind. Appl.",
+  volume        = "31",
+  year          = "1995-09/1995-10",
+  pages         = "1047-1053"
+}
+
+@unpublished{IEEEexample:unpublished,
+  author        = "T. J. Ott and N. Aggarwal",
+  title         = "{TCP} over {ATM}: {ABR} or {UBR}",
+  howpublished  = "Unpublished"
+}
+
+@report{IEEEexample:techreptype,
+  author        = "J. Padhye and V. Firoiu and D. Towsley",
+  title         = "A Stochastic Model of {TCP} {R}eno Congestion Avoidance
+                   and Control",
+  institution   = "Univ. of Massachusetts",
+  location      = "Amherst, MA",
+  type          = "CMPSCI Tech. Rep.",
+  number        = "99-02",
+  year          = "1999",
+}
+
+@book{IEEEexample:inbook,
+  author        = "H. E. Rose",
+  title         = "A Course in Number Theory",
+  publisher     = "Oxford Univ. Press",
+  location      = "New York",
+  year          = "1988",
+  chapter       = "3"
+}
+
+@patent{IEEEexample:uspat,
+  author        = "Ronald E. Sorace and Victor S. Reinhardt and
+                   Steven A. Vaughn",
+  holder        = "Hughes Aircraft Company",
+  location      = "Los Angeles, CA",
+  title         = "High-Speed Digital-to-{RF} Converter",
+  type          = "patentus",
+  number        = "5668842",
+  yearfiled     = "1995-02-28",
+  year          = "1997-09-16",
+}
+
+@inbook{IEEEexample:incollection,
+  author        = "W. V. Sorin",
+  editor        = "D. Derickson",
+  title         = "Optical Reflectometry for Component Characterization",
+  booktitle     = "Fiber Optic Test and Measurement",
+  publisher     = "Prentice--Hall",
+  location      = "Englewood Cliffs, NJ",
+  year          = "1998"
+}
+
+@online{IEEEexample:electronhowinfo2,
+  author        = "V. Valloppillil and K. W. Ross",
+  title         = "Cache Array Routing Protocol v1.1",
+  howpublished  = "Internet draft",
+  url           = "http://ds1.internic.net/internet-drafts/draft-vinod-carp-v1-03.txt",
+  year          = "1998"
+}
+
+@inproceedings{IEEEexample:confwithpaper,
+  author        = "M. Wegmuller and J. P. von der Weid and P. Oberson
+                   and N. Gisin",
+  title         = "High Resolution Fiber Distributed Measurements With
+                   Coherent {OFDR}",
+  booktitle     = "Proc. {ECOC}'00",
+  year          = "2000",
+  location      = "Munich, Germany",
+  pages         = "109"
+}
+
+@inproceedings{IEEEexample:confwithvolume,
+  author        = "M. Yajnik and S. B. Moon and J. Kurose and D. Towsley",
+  title         = "Measurement and Modeling of the Temporal Dependence in
+                   Packet Loss",
+  booktitle     = "Proc. {IEEE} {INFOCOM}'99",
+  volume        = "1",
+  location      = "New York",
+  year          = "1999-03",
+  pages         = "345-352"
+}
+
+@inproceedings{IEEEexample:confwithadddays,
+  author        = "M. S. Yee and L. Hanzo",
+  title         = "Radial Basis Function Decision Feedback Equaliser
+                   Assisted Burst-by-burst Adaptive Modulation",
+  booktitle     = "Proc. {IEEE} Globecom '99",
+  address       = "Rio de Janeiro, Brazil",
+  year          = "1999-12-05/1999-12-09",
+  pages         = "2183-2187"
+}
+
+%% 
+%% Copyright (C) 2011-2013,2015-2018 by
+%%   Joseph Wright <joseph.wright at morningstar2.co.uk>
+%% 
+%% It may be distributed and/or modified under the conditions of
+%% the LaTeX Project Public License (LPPL), either version 1.3c of
+%% this license or (at your option) any later version.  The latest
+%% version of this license is in the file:
+%% 
+%%    http://www.latex-project.org/lppl.txt
+%% 
+%% This work is "maintained" (as per LPPL maintenance status) by
+%%   Joseph Wright.
+%% 
+%% This work consists of the files biblatex-ieee.bib,
+%%                                 biblatex-ieee.tex,
+%%                                 ieee.bbx,
+%%                                 ieee.cbx,
+%%                                 ieee-alphabetic.bbx,
+%%                                 ieee-alphabetic.cbx and
+%%                                 magyar-ieee.lbx,
+%%           and the derived files biblatex-ieee.pdf and
+%%                                 biblatex-ieee-alphabetic.pdf.
+%% 
+%%
+%% End of file `biblatex-ieee.bib'.
diff --git a/macros/latex/contrib/biblatex-contrib/biblatex-ieee/biblatex-ieee.pdf b/macros/latex/contrib/biblatex-contrib/biblatex-ieee/biblatex-ieee.pdf
new file mode 100644
index 0000000000..078a415360
--- /dev/null
+++ b/macros/latex/contrib/biblatex-contrib/biblatex-ieee/biblatex-ieee.pdf
diff --git a/macros/latex/contrib/biblatex-contrib/biblatex-ieee/biblatex-ieee.tex b/macros/latex/contrib/biblatex-contrib/biblatex-ieee/biblatex-ieee.tex
new file mode 100644
index 0000000000..d6c3ae18d3
--- /dev/null
+++ b/macros/latex/contrib/biblatex-contrib/biblatex-ieee/biblatex-ieee.tex
@@ -0,0 +1,173 @@
+%% ---------------------------------------------------------------
+%% biblatex-ieee --- A biblatex implementation of the IEEE 
+%%   bibliography style
+%% Maintained by Joseph Wright
+%% E-mail: joseph.wright@morningstar2.co.uk
+%% Released under the LaTeX Project Public License v1.3c or later
+%% See http://www.latex-project.org/lppl.txt
+%% ---------------------------------------------------------------
+%% 
+
+\documentclass[a4paper]{ltxdoc}
+\usepackage{lmodern}
+\usepackage[T1]{fontenc}
+\usepackage[style=ieee,backend=biber]{biblatex}
+\usepackage[final]{microtype}
+\usepackage{csquotes}
+\usepackage{hyperref}
+
+\hypersetup{hidelinks}
+
+\addbibresource{biblatex-ieee.bib}
+
+\author{Joseph Wright\thanks{E-mail: 
+  \href{mailto:joseph.wright@morningstar2.co.uk}
+  {\texttt{joseph.wright@morningstar2.co.uk}}}}
+\title{The \pkg{ieee} bibliography style for \pkg{biblatex}%
+  \footnote{This file describes v1.3a, last revised 2019/06/19.}}
+\date{Released 2019/06/19}
+
+\providecommand*{\opt}[1]{\texttt{#1}}
+\providecommand*{\pkg}[1]{\textsf{#1}}
+
+\RecordChanges
+
+\begin{document}
+
+\maketitle
+
+This package provides a style for \pkg{biblatex} which follows the
+guidelines of the \textsc{ieee}. The citation style is numeric and unsorted.
+The bibliography style follows the pattern of the official \pkg{IEEEtran}
+package (\url{http://www.ieee.org/documents/style_manual.pdf}). The style
+should be loaded in the usual way
+\begin{verbatim}
+  \usepackage[style=ieee]{biblatex}
+\end{verbatim}
+The References section of this document demonstrates the format 
+generated by the package using the \texttt{biblatex-ieee.bib} database
+of example citations.
+
+The style introduces new bibliography strings:
+\begin{description}
+  \item[\texttt{patentjp}] the text \enquote{Japanese Patent};
+  \item[\texttt{presentedat}] the text \enquote{presented at the} when 
+    printing conference papers using the name of the conference rather 
+    than a reference to a book of abstracts.
+\end{description}
+These may be localized in the usual way.
+
+The style adds the \opt{dashed} option to those recognised: as-standard,
+this is activated. The option works in the same way as that from the
+core \pkg{biblatex} style \pkg{author-year}.
+
+The appearance of URLs in the bibliography is set by the mechanism of the
+\textsf{url} package. Thus to print URLs in the current roman font,
+place the instruction
+\begin{verbatim}
+  \renewcommand*{\UrlFont}{\rmfamily}
+\end{verbatim}
+immediately before
+\begin{verbatim}
+  \printbibliography
+\end{verbatim}
+
+Also include in the bundle is a style using alphabetic labels, but otherwise
+following the guidelines of the \textsc{ieee}. This style should be loaded
+using
+\begin{verbatim}
+  \usepackage[style=ieee-alphabetic]{biblatex}
+\end{verbatim}
+It is demonstrated in the accompany \textsc{pdf} file
+\texttt{biblatex-ieee-alphabetic}.
+
+Suggestions for improvement and bug reports can be logged in the package
+issue database, found at
+\url{https://github.com/josephwright/biblatex-ieee/issues/}, or can
+be sent by e-mail to 
+\href{mailto:joseph.wright@morningstar2.co.uk}
+  {\texttt{joseph.wright@morningstar2.co.uk}}.
+\nocite{*}
+
+\printbibliography
+
+\changes{v1.0}{2011/02/27}{First stable release}
+\changes{v1.0a}{2011/04/07}{Print \enquote{presented at} for
+  \texttt{inproceedings} entries only if an \texttt{eventtitle} is
+  available}
+\changes{v1.0b}{2011/05/07}{Add instructions for printing URL in roman font}
+\changes{v1.0b}{2011/05/07}{Use dash for repeated author names}
+\changes{v1.0c}{2012/03/21}{Turn off citation sorting}
+\changes{v1.0c}{2012/03/21}{Set \emph{et al.}~in italics}
+\changes{v1.0c}{2012/03/21}{Use two em-dashes for repeated names}
+\changes{v1.0d}{2012/03/23}{Place \texttt{series} before \texttt{editor}
+  for \texttt{incollection} entries}
+\changes{v1.1}{2012/05/03}{New alphabetic style \texttt{ieee-alphabetic}}
+\changes{v1.1}{2012/05/03}{Update citation-related options set by the style}
+\changes{v1.1a}{2012/06/16}{Bracket citation numbers singly, not as a group}
+\changes{v1.1a}{2012/06/16}{Omit comma after \texttt{!} and \texttt{?}
+  if this occurs at the end of a title}
+\changes{v1.1b}{2012/07/18}{Fix spacing between bibliography label and entry}
+\changes{v1.1c}{2012/10/04}{Improve handling of names in \cs{textcite}}
+\changes{v1.1d}{2012/10/12}{Improve handling of names in \cs{textcite} again}
+\changes{v1.1e}{2012/12/04}{Address brackets around citations again, hopefully
+ correctly this time}
+\changes{v1.1e}{2012/12/04}{Use US-style punctuation suppression}
+\changes{v1.1f}{2012/12/17}{Fix brackets in \cs{textcite}}
+\changes{v1.1g}{2013/01/27}{Include data for related entries}
+\changes{v1.1h}{2013/02/08}{Print post-notes within brackets surrounding
+  citation number}
+\changes{v1.1i}{2013/06/13}{Remove extraneous bracket when \cs{cites} is used}
+\changes{v1.1j}{2013/10/25}{Update \cs{textcite} code for \pkg{biblatex}~v2.7}
+\changes{v1.1j}{2013/10/25}{Correctly format multi-part page ranges}
+\changes{v1.1k}{2015/03/12}{Capitalise after colon in titles}
+\changes{v1.1l}{2015/03/25}{Respect braces for capitalisation in titles}
+\changes{v1.1m}{2016/04/06}{Track \pkg{biblatex} changes}
+\changes{v1.1m}{2016/04/16}{Much simplified citation style approach}
+\changes{v1.1n}{2016/05/08}{Fix printing of titles when braced in
+  database}
+\changes{v1.1o}{2016/06/27}{Fix capitalisation of journal titles}
+\changes{v1.1p}{2016/07/20}{Revert changes in internal code for citation
+  handling}
+\changes{v1.1q}{2016/08/31}{Fix stray space after \enquote{\emph{et al.}}}
+\changes{v1.2}{2016/12/26}{New \opt{dashed} option}
+\changes{v1.2}{2016/12/29}{Refine handling of case changing in titles}
+\changes{v1.2}{2016/12/30}{Use title case for book tiles}
+\changes{v1.2a}{2017/02/02}{Minor internal updates}
+\changes{v1.2a}{2017/03/01}{Move some formatting directives}
+\changes{v1.2a}{2017/03/01}{More work on formatting of titles}
+\changes{v1.2b}{2017/03/22}{Fix accidental printing of string \texttt{no.}}
+\changes{v1.2c}{2017/03/25}{Fix formatting for volume in some entry types}
+\changes{v1.2d}{2017/03/26}{Subtle adjustment for volume string}
+\changes{v1.3}{2018/08/20}{Hungarian localisation}
+
+\PrintChanges
+
+\end{document}
+
+%% 
+%% Copyright (C) 2011-2013,2015-2018 by
+%%   Joseph Wright <joseph.wright@morningstar2.co.uk>
+%% 
+%% It may be distributed and/or modified under the conditions of
+%% the LaTeX Project Public License (LPPL), either version 1.3c of
+%% this license or (at your option) any later version.  The latest
+%% version of this license is in the file:
+%% 
+%%    http://www.latex-project.org/lppl.txt
+%% 
+%% This work is "maintained" (as per LPPL maintenance status) by
+%%   Joseph Wright.
+%% 
+%% This work consists of the files biblatex-ieee.bib,
+%%                                 biblatex-ieee.tex,
+%%                                 ieee.bbx,
+%%                                 ieee.cbx,
+%%                                 ieee-alphabetic.bbx,
+%%                                 ieee-alphabetic.cbx and
+%%                                 magyar-ieee.lbx,
+%%           and the derived files biblatex-ieee.pdf and
+%%                                 biblatex-ieee-alphabetic.pdf.
+%% 
+%%
+%% End of file `biblatex-ieee.tex'.
diff --git a/macros/latex/contrib/biblatex-contrib/biblatex-ieee/ieee-alphabetic.bbx b/macros/latex/contrib/biblatex-contrib/biblatex-ieee/ieee-alphabetic.bbx
new file mode 100644
index 0000000000..ed684e53c3
--- /dev/null
+++ b/macros/latex/contrib/biblatex-contrib/biblatex-ieee/ieee-alphabetic.bbx
@@ -0,0 +1,80 @@
+%% ---------------------------------------------------------------
+%% biblatex-ieee --- A biblatex implementation of the IEEE 
+%%   bibliography style
+%% Maintained by Joseph Wright
+%% E-mail: joseph.wright@morningstar2.co.uk
+%% Released under the LaTeX Project Public License v1.3c or later
+%% See http://www.latex-project.org/lppl.txt
+%% ---------------------------------------------------------------
+%% 
+
+\ProvidesFile{ieee-alphabetic.bbx}[2019/06/19 v1.3a biblatex bibliography style]
+
+\RequireBibliographyStyle{ieee}
+
+% Alter settings that carry through from biblatex
+\ExecuteBibliographyOptions{
+  labelalpha,
+  sorting = anyt,
+  useprefix
+}
+
+% This is all a straight copy from alphabetic.bbx
+\DeclareFieldFormat{labelalphawidth}{\mkbibbrackets{#1}}
+\DeclareFieldFormat{shorthandwidth}{\mkbibbrackets{#1}}
+
+\defbibenvironment{bibliography}
+  {\list
+     {\printtext[labelalphawidth]{%
+        \printfield{labelprefix}%
+	\printfield{labelalpha}%
+        \printfield{extraalpha}}}
+     {\setlength{\labelwidth}{\labelalphawidth}%
+      \setlength{\leftmargin}{\labelwidth}%
+      \setlength{\labelsep}{\biblabelsep}%
+      \addtolength{\leftmargin}{\labelsep}%
+      \setlength{\itemsep}{\bibitemsep}%
+      \setlength{\parsep}{\bibparsep}}%
+      \renewcommand*{\makelabel}[1]{##1\hss}}
+  {\endlist}
+  {\item}
+
+\defbibenvironment{shorthands}
+  {\list
+     {\printfield[shorthandwidth]{shorthand}}
+     {\setlength{\labelwidth}{\shorthandwidth}%
+      \setlength{\leftmargin}{\labelwidth}%
+      \setlength{\labelsep}{\biblabelsep}%
+      \addtolength{\leftmargin}{\labelsep}%
+      \setlength{\itemsep}{\bibitemsep}%
+      \setlength{\parsep}{\bibparsep}%
+      \renewcommand*{\makelabel}[1]{##1\hss}}}
+  {\endlist}
+  {\item}
+
+%% 
+%% Copyright (C) 2011-2013,2015-2018 by
+%%   Joseph Wright <joseph.wright@morningstar2.co.uk>
+%% 
+%% It may be distributed and/or modified under the conditions of
+%% the LaTeX Project Public License (LPPL), either version 1.3c of
+%% this license or (at your option) any later version.  The latest
+%% version of this license is in the file:
+%% 
+%%    http://www.latex-project.org/lppl.txt
+%% 
+%% This work is "maintained" (as per LPPL maintenance status) by
+%%   Joseph Wright.
+%% 
+%% This work consists of the files biblatex-ieee.bib,
+%%                                 biblatex-ieee.tex,
+%%                                 ieee.bbx,
+%%                                 ieee.cbx,
+%%                                 ieee-alphabetic.bbx,
+%%                                 ieee-alphabetic.cbx and
+%%                                 magyar-ieee.lbx,
+%%           and the derived files biblatex-ieee.pdf and
+%%                                 biblatex-ieee-alphabetic.pdf.
+%% 
+%%
+%% End of file `ieee-alphabetic.bbx'.
diff --git a/macros/latex/contrib/biblatex-contrib/biblatex-ieee/ieee-alphabetic.cbx b/macros/latex/contrib/biblatex-contrib/biblatex-ieee/ieee-alphabetic.cbx
new file mode 100644
index 0000000000..edc22f20b0
--- /dev/null
+++ b/macros/latex/contrib/biblatex-contrib/biblatex-ieee/ieee-alphabetic.cbx
@@ -0,0 +1,72 @@
+%% ---------------------------------------------------------------
+%% biblatex-ieee --- A biblatex implementation of the IEEE 
+%%   bibliography style
+%% Maintained by Joseph Wright
+%% E-mail: joseph.wright@morningstar2.co.uk
+%% Released under the LaTeX Project Public License v1.3c or later
+%% See http://www.latex-project.org/lppl.txt
+%% ---------------------------------------------------------------
+%% 
+
+\ProvidesFile{ieee-alphabetic.cbx}[2019/06/19 v1.3a biblatex citation style]
+
+\RequireCitationStyle{alphabetic}
+
+\ifcsdef{blx@backend}
+  {%
+    \ifnumequal\blx@backend\blx@backend@biber
+      {%
+        \ExecuteBibliographyOptions{
+          maxalphanames = 4,
+          maxcitenames  = 3,
+          minalphanames = 3,
+          minnames      = 1
+        }%
+      }
+      {%
+        \ExecuteBibliographyOptions{
+          maxcitenames  = 4,
+          minnames      = 3
+        }%
+        \protected\edef\abx@macro@textcite{%
+          \defcounter{maxnames}{3}%
+          \defcounter{minnames}{1}%
+          \unexpanded\expandafter{\abx@macro@textcite}%
+        }%
+      }%
+  }
+  {%
+    \ExecuteBibliographyOptions{
+      maxalphanames = 4,
+      maxcitenames  = 3,
+      minalphanames = 3,
+      minnames      = 1
+    }%
+  }
+
+%% 
+%% Copyright (C) 2011-2013,2015-2018 by
+%%   Joseph Wright <joseph.wright@morningstar2.co.uk>
+%% 
+%% It may be distributed and/or modified under the conditions of
+%% the LaTeX Project Public License (LPPL), either version 1.3c of
+%% this license or (at your option) any later version.  The latest
+%% version of this license is in the file:
+%% 
+%%    http://www.latex-project.org/lppl.txt
+%% 
+%% This work is "maintained" (as per LPPL maintenance status) by
+%%   Joseph Wright.
+%% 
+%% This work consists of the files biblatex-ieee.bib,
+%%                                 biblatex-ieee.tex,
+%%                                 ieee.bbx,
+%%                                 ieee.cbx,
+%%                                 ieee-alphabetic.bbx,
+%%                                 ieee-alphabetic.cbx and
+%%                                 magyar-ieee.lbx,
+%%           and the derived files biblatex-ieee.pdf and
+%%                                 biblatex-ieee-alphabetic.pdf.
+%% 
+%%
+%% End of file `ieee-alphabetic.cbx'.
diff --git a/macros/latex/contrib/biblatex-contrib/biblatex-ieee/ieee.bbx b/macros/latex/contrib/biblatex-contrib/biblatex-ieee/ieee.bbx
new file mode 100644
index 0000000000..ac90ffa973
--- /dev/null
+++ b/macros/latex/contrib/biblatex-contrib/biblatex-ieee/ieee.bbx
@@ -0,0 +1,817 @@
+%% ---------------------------------------------------------------
+%% biblatex-ieee --- A biblatex implementation of the IEEE
+%%   bibliography style
+%% Maintained by Joseph Wright
+%% E-mail: joseph.wright@morningstar2.co.uk
+%% Released under the LaTeX Project Public License v1.3c or later
+%% See http://www.latex-project.org/lppl.txt
+%% ---------------------------------------------------------------
+%%
+
+\ProvidesFile{ieee.bbx}[2019/06/19 v1.3a biblatex bibliography style]
+
+% Load the standard style to avoid copy-pasting unnecessary material
+\RequireBibliographyStyle{numeric-comp}
+
+% An option that carries through from author-year styles
+\DeclareBibliographyOption[boolean]{dashed}[true]{%
+  \ifstrequal{#1}{true}
+    {\ExecuteBibliographyOptions{pagetracker}%
+     \renewbibmacro*{bbx:savehash}{\savefield{fullhash}{\bbx@lasthash}}}
+    {\renewbibmacro*{bbx:savehash}{}}}
+
+% Alter settings that carry through from biblatex
+\ExecuteBibliographyOptions{
+  giveninits,
+  maxnames = 999,
+  minnames = 3,
+  sorting  = none
+}
+\uspunctuation
+
+% Load language-specific customizations
+\DeclareLanguageMapping{magyar}{magyar-ieee}
+% If more language-specific customizations besides magyar should get
+% added, the above explicit mapping per language can be replaced with:
+% \DeclareLanguageMappingSuffix{-ieee}
+
+% Custom field formats
+\DeclareFieldFormat[article]{number}{\bibstring{number}\addnbspace#1}
+\DeclareFieldFormat[patent]{number}{\mkonepagegrouped{#1}}
+\DeclareFieldFormat{pages}{%
+  \mkpageprefix[bookpagination][\mkpagegrouped]{#1}%
+}
+\DeclareFieldFormat{sentencecase}{\bbx@colon@search{\MakeSentenceCase*}{#1}}
+\DeclareFieldFormat[book,inbook,incollection,inproceedings]{series}
+  {\bibstring{jourser}\addnbspace#1}
+\DeclareFieldFormat[online]{title}{#1\isdot}
+\DeclareFieldFormat[report]{title}{\mkbibquote{#1\isdot}}
+\DeclareFieldFormat{url}{\bibstring{url}\addcolon\space\url{#1}}
+\DeclareFieldFormat*{volume}
+  {\bibstring{volume}\addnbspace#1}
+\DeclareFieldFormat[article,periodical]{volume}
+  {\bibstring{jourvol}\addnbspace#1}
+
+% Simple modifications to punctuation, etc.
+\renewcommand*\bibnamedash{\textemdash\textemdash}
+\renewcommand*\intitlepunct{\addspace}
+\renewcommand*\newunitpunct{\addcomma\addspace}
+
+% Bibliography strings
+\NewBibliographyString{patentjp}
+\NewBibliographyString{presentedat}
+
+\DefineBibliographyStrings{english}{
+  andothers   = \mkbibemph{et al\adddot}           ,
+  chapter     = ch\adddot                          ,
+  editor      = Ed\adddot                          ,
+  editors     = Eds\adddot                         ,
+  mathesis    = Master's thesis                    ,
+  patentjp    = Japanese Patent                    ,
+  patentus    = U\adddot S\adddot\addspace Patent  ,
+  presentedat = presented at the\addspace          ,
+  techreport  = Tech\adddot\addspace Rep\adddot    ,
+  url         = [Online]\adddot\addspace Available ,
+}
+
+\DefineBibliographyStrings{english}{
+  june      = Jun\adddot ,
+  july      = Jul\adddot ,
+  september = Sep\adddot ,
+}
+
+% Support for dashed author name replacement
+\InitializeBibliographyStyle{\global\undef\bbx@lasthash}
+
+\newbibmacro*{bbx:savehash}{\savefield{fullhash}{\bbx@lasthash}}
+
+% Bibliography macros
+\renewbibmacro*{author}{%
+  \ifboolexpr{
+    test \ifuseauthor
+    and
+    not test {\ifnameundef{author}}
+  }
+    {%
+      \iffieldequals{fullhash}{\bbx@lasthash}
+        {\bibnamedash\addcomma\space}
+        {\printnames{author}}%
+      \usebibmacro{bbx:savehash}%
+      \iffieldundef{authortype}
+        {}
+        {%
+          \setunit{\addcomma\space}%
+          \usebibmacro{authorstrg}%
+        }%
+    }
+    {\global\undef\bbx@lasthash}%
+}
+
+\renewbibmacro*{bybookauthor}{%
+  \ifnamesequal{author}{bookauthor}
+    {}
+    {%
+      \iffieldundef{bookauthor}
+        {}
+        {%
+          \printnames{bookauthor}%
+          \newunit
+       }%
+    }%
+}
+
+\renewbibmacro*{byeditor+others}{%
+  \ifnameundef{editor}
+    {}
+    {%
+      \usebibmacro{editor}%
+      \setunit{\addspace}%
+      \printnames[byeditor]{editor}%
+      \clearname{editor}%
+      \newunit
+    }%
+  \usebibmacro{byeditorx}%
+  \usebibmacro{bytranslator+others}%
+}
+
+\renewbibmacro*{doi+eprint+url}{%
+  \setunit{\adddot\addspace}%
+  \iftoggle{bbx:doi}
+    {\printfield{doi}}
+    {}%
+  \setunit{\adddot\addspace}%
+  \iftoggle{bbx:eprint}
+    {\usebibmacro{eprint}}
+    {}%
+  \setunit{\adddot\addspace}%
+  \iftoggle{bbx:url}
+    {\usebibmacro{url+urldate}}
+    {}%
+}
+
+\renewbibmacro*{event+venue+date}{%
+  \iffieldundef{eventtitle}
+    {}
+    {%
+      \bibstring{presentedat}%
+      \printfield{eventtitle}%
+    }%
+  \ifboolexpr{
+    test {\iffieldundef{venue}}
+    and
+    test {\iffieldundef{eventyear}}
+  }
+    {}
+    {\setunit*{\addspace}%
+     \printtext[parens]{%
+       \printfield{venue}%
+       \setunit*{\addcomma\space}%
+       \printeventdate}}%
+  \newunit
+}
+
+\newbibmacro*{institution+location}{%
+  \printlist{institution}%
+  \newunit
+  \printlist{location}%
+  \newunit
+}
+
+\renewbibmacro*{institution+location+date}{%
+  \printlist{institution}%
+  \newunit
+  \printlist{location}%
+  \newunit
+  \usebibmacro{date}%
+  \newunit
+}
+
+\renewbibmacro*{issue+date}{%
+  \printtext{%
+    \iffieldundef{issue}
+      {\usebibmacro{date}}
+      {%
+        \printfield{issue}%
+        \setunit*{\addspace}%
+        \usebibmacro{date}%
+      }%
+  }%
+  \newunit
+  \usebibmacro{issue}%
+  \newunit
+}
+
+\renewbibmacro*{journal}{%
+  \iffieldundef{journaltitle}
+    {}
+    {%
+      \printtext[journaltitle]{%
+         \printfield[titlecase]{journaltitle}%
+         \printfield[titlecase]{journalsubtitle}%
+      }%
+    }%
+  \midsentence
+}
+
+\renewbibmacro*{journal+issuetitle}{%
+  \usebibmacro{journal}%
+  \newunit
+  \iffieldundef{series}
+    {}
+    {%
+      \newunit
+      \printfield{series}%
+      \newunit
+    }%
+  \usebibmacro{volume+number+eid}%
+  \setunit{\addspace}%
+}
+
+\renewbibmacro*{maintitle+booktitle}{%
+  \iffieldundef{maintitle}
+    {}
+    {%
+      \usebibmacro{maintitle}%
+      \newunit\newblock
+    }%
+  \usebibmacro{booktitle}%
+  \newunit
+}
+
+\newbibmacro*{maintitle+booktitle(inproceedings)}{%
+  \iffieldundef{maintitle}
+    {%
+      \iffieldundef{booktitle}
+        {}
+        {%
+          \usebibmacro{in:}%
+          \usebibmacro{maintitle+booktitle}%
+          \clearfield{eventtitle}%
+          \clearfield{number}%
+        }%
+    }
+    {%
+      \usebibmacro{in:}%
+      \usebibmacro{maintitle+booktitle}%
+      \clearfield{eventtitle}%
+      \clearfield{number}%
+    }%
+}
+
+\renewbibmacro*{maintitle+title}{%
+  \iffieldsequal{maintitle}{title}
+    {%
+      \clearfield{maintitle}%
+      \clearfield{mainsubtitle}%
+      \clearfield{maintitleaddon}%
+    }
+    {%
+      \iffieldundef{maintitle}
+        {}
+        {%
+          \usebibmacro{maintitle}%
+          \newunit\newblock
+        }%
+    }%
+  \usebibmacro{title-in-maintitle}%
+  \newunit
+}
+
+\newbibmacro*{pages}{%
+  \setunit{\bibpagespunct}%
+  \printfield{pages}%
+}
+
+\renewbibmacro*{title}{%
+  \ifboolexpr{
+    test {\iffieldundef{title}}
+    and
+    test {\iffieldundef{subtitle}}
+  }
+    {}
+    {%
+      \printtext[title]{%
+        \printfield[sentencecase]{title}%
+        \setunit{\subtitlepunct}%
+        \printfield[sentencecase]{subtitle}%
+      }%
+      \newunit
+    }%
+  \printfield{titleaddon}%
+}
+
+\newbibmacro*{title-in-maintitle}{%
+  \ifboolexpr{
+    test {\iffieldundef{title}}
+    and
+    test {\iffieldundef{subtitle}}
+  }
+    {}
+    {%
+      \printtext[title]{%
+        \printfield[titlecase]{title}%
+        \setunit{\subtitlepunct}%
+        \printfield[titlecase]{subtitle}%
+      }%
+      \newunit
+    }%
+  \printfield{titleaddon}%
+}
+
+\renewbibmacro*{volume+number+eid}{%
+  \printfield{volume}%
+  \newunit
+  \printfield{number}%
+  \newunit
+  \printfield{eid}%
+}
+
+\newbibmacro*{volume+part}{%
+  \iffieldundef{volume}
+    {}
+    {%
+      \printfield{volume}%
+      \printfield{part}%
+      \setunit{\addcolon\space}%
+    }%
+}
+
+% Specialised functions for manipulating data, where the biblatex
+% kernel does not provide a suitable function.
+\newcommand*{\mkpagegrouped}[1]{%
+  \mkpagegrouped@aux#1\bibrangedash&%
+}
+
+\newcommand*{\mkpagegrouped@aux}{}
+\def\mkpagegrouped@aux#1\bibrangedash#2&{%
+  \mkonepagegrouped{#1}%
+  \ifblank{#2}
+    {}
+    {%
+      \bibrangedash
+      \mkpagegrouped@second#2&%
+    }%
+}
+
+\newcommand*{\mkonepagegrouped}[1]{%
+  \ifinteger{#1}
+    {%
+      \mkpagegrouped@ifmorethanfour{#1}
+        {\mkpagegrouped@separate{}#1\@empty\@empty\@empty}
+        {#1}%
+     }
+     {#1}%
+}
+
+\newcommand*{\mkpagegrouped@second}{}
+\def\mkpagegrouped@second#1\bibrangedash&{%
+  \mkpagegrouped@second@auxi#1\bibrangessep&%
+}
+
+\newcommand*{\mkpagegrouped@second@auxi}{}
+\def\mkpagegrouped@second@auxi#1\bibrangessep#2&{%
+   \mkonepagegrouped{#1}%
+   \ifblank{#2}
+     {}
+     {%
+       \bibrangessep
+       \mkpagegrouped@second@auxii#2&%
+     }%
+}
+
+\newcommand*{\mkpagegrouped@second@auxii}{}
+\def\mkpagegrouped@second@auxii#1\bibrangessep&{%
+  \mkpagegrouped{#1}%
+}
+
+\newcommand*{\mkpagegrouped@ifmorethanfour}[1]{%
+  \mkpagegrouped@ifmorethanfour@aux#1\@empty\@empty\@empty\@empty
+    \@empty\@nil
+}
+
+\newcommand*{\mkpagegrouped@ifmorethanfour@aux}{}
+\def\mkpagegrouped@ifmorethanfour@aux#1#2#3#4#5\@nil{%
+ \ifx\@empty#5\@empty
+   \expandafter\@secondoftwo
+  \else
+    \expandafter\@firstoftwo
+  \fi
+}
+
+\newcommand*{\mkpagegrouped@separate}[4]{%
+  \ifx\@empty#2\@empty
+    \mkpagegrouped@print#1\relax
+  \else
+    \ifx\@empty#3\@empty
+      \mkpagegrouped@print\@empty\@empty#1#2\relax
+    \else
+      \ifx\@empty#4\@empty
+        \mkpagegrouped@print\@empty#1#2#3\relax
+      \else
+        \mkpagegrouped@separate@aux{#1#2#3#4}%
+      \fi
+    \fi
+  \fi
+}
+
+\newcommand*{\bbx@digits@separate@aux}{}
+\def\mkpagegrouped@separate@aux#1\fi\fi\fi{%
+  \fi\fi\fi\mkpagegrouped@separate{#1}%
+}
+
+\newcommand*{\mkpagegrouped@print}[4]{%
+  \ifblank{#1}{}{#1}%
+  #2#3%
+  \ifx#4\relax
+  \else
+    \addnbthinspace
+    \expandafter\mkpagegrouped@print\expandafter#4%
+  \fi
+}
+
+% {<process>} {<text>}
+\newcommand*{\bbx@colon@search}[2]{%
+  \bbx@colon@search@auxi\empty#2: \stop{#1}%
+}
+\long\def\bbx@colon@search@auxi#1: #2\stop#3{%
+  \expandafter\bbx@colon@search@auxii\expandafter{#1}{#3}%
+  \ifblank{#2}
+    {}
+    {%
+      : %
+      \bbx@colon@search@auxi\empty#2\stop{#3}%
+    }%
+}
+\newcommand\bbx@colon@search@auxii[2]{#2{#1}}
+
+% New bibliography drivers, using the required order of fields. These
+% are mainly copied from standard.bbx then modified.
+\DeclareBibliographyDriver{article}{%
+  \usebibmacro{bibindex}%
+  \usebibmacro{begentry}%
+  \usebibmacro{author/translator+others}%
+  \newunit
+  \usebibmacro{title}%
+  \newunit
+  \printlist{language}%
+  \newunit\newblock
+  \usebibmacro{byauthor}%
+  \newunit\newblock
+  \usebibmacro{bytranslator+others}%
+  \newunit\newblock
+  \printfield{version}%
+  \newunit\newblock
+  \usebibmacro{journal+issuetitle}%
+  \newunit
+  \usebibmacro{byeditor+others}%
+  \newunit
+  \usebibmacro{pages}%
+  \newunit
+  \usebibmacro{issue+date}%
+  \newunit
+  \printfield{note}%
+  \newunit\newblock
+  \iftoggle{bbx:isbn}
+    {\printfield{issn}}
+    {}%
+  \newunit\newblock
+  \usebibmacro{doi+eprint+url}%
+  \newunit\newblock
+  \usebibmacro{addendum+pubstate}%
+  \setunit{\bibpagerefpunct}\newblock
+  \usebibmacro{pageref}%
+  \newunit\newblock
+  \iftoggle{bbx:related}
+    {\usebibmacro{related:init}%
+     \usebibmacro{related}}
+    {}%
+  \usebibmacro{finentry}}
+
+\DeclareBibliographyDriver{book}{%
+  \usebibmacro{bibindex}%
+  \usebibmacro{begentry}%
+  \usebibmacro{author/editor+others/translator+others}%
+  \setunit{\labelnamepunct}\newblock
+  \usebibmacro{maintitle+title}%
+  \newunit
+  \printlist{language}%
+  \newunit\newblock
+  \printfield{edition}%
+  \newunit\newblock
+  \usebibmacro{byauthor}%
+  \newunit\newblock
+  \usebibmacro{byeditor+others}%
+  \newunit\newblock
+  \printfield{volumes}%
+  \newunit\newblock
+  \usebibmacro{series+number}%
+  \setunit{\adddot\addspace}%
+  \newblock
+  \usebibmacro{publisher+location+date}%
+  \newunit\newblock
+  \usebibmacro{volume+part}%
+  \newunit
+  \usebibmacro{chapter+pages}%
+  \newunit
+  \printfield{pagetotal}%
+  \newunit\newblock
+  \printfield{note}%
+  \newunit\newblock
+  \iftoggle{bbx:isbn}
+    {\printfield{isbn}}
+    {}%
+  \newunit\newblock
+  \usebibmacro{doi+eprint+url}%
+  \newunit\newblock
+  \usebibmacro{addendum+pubstate}%
+  \setunit{\bibpagerefpunct}\newblock
+  \usebibmacro{pageref}%
+  \newunit\newblock
+  \iftoggle{bbx:related}
+    {\usebibmacro{related:init}%
+     \usebibmacro{related}}
+    {}%
+  \usebibmacro{finentry}}
+
+\DeclareBibliographyDriver{inbook}{%
+  \usebibmacro{bibindex}%
+  \usebibmacro{begentry}%
+  \usebibmacro{author/translator+others}%
+  \setunit{\labelnamepunct}\newblock
+  \usebibmacro{title}%
+  \newunit
+  \printlist{language}%
+  \newunit\newblock
+  \usebibmacro{byauthor}%
+  \newunit\newblock
+  \usebibmacro{in:}%
+  \usebibmacro{bybookauthor}%
+  \usebibmacro{maintitle+booktitle}%
+  \newunit\newblock
+  \usebibmacro{byeditor+others}%
+  \newunit\newblock
+  \printfield{edition}%
+  \newunit
+  \printfield{volumes}%
+  \newunit\newblock
+  \usebibmacro{series+number}%
+  \setunit{\adddot\addspace}%
+  \newblock
+  \usebibmacro{publisher+location+date}%
+  \newunit\newblock
+  \usebibmacro{volume+part}%
+  \newunit
+  \usebibmacro{chapter+pages}%
+  \newunit\newblock
+  \printfield{note}%
+  \newunit\newblock
+  \iftoggle{bbx:isbn}
+    {\printfield{isbn}}
+    {}%
+  \newunit\newblock
+  \usebibmacro{doi+eprint+url}%
+  \newunit\newblock
+  \usebibmacro{addendum+pubstate}%
+  \setunit{\bibpagerefpunct}\newblock
+  \usebibmacro{pageref}%
+  \newunit\newblock
+  \iftoggle{bbx:related}
+    {\usebibmacro{related:init}%
+     \usebibmacro{related}}
+    {}%
+  \usebibmacro{finentry}}
+
+\DeclareBibliographyDriver{incollection}{%
+  \usebibmacro{bibindex}%
+  \usebibmacro{begentry}%
+  \usebibmacro{author/translator+others}%
+  \setunit{\labelnamepunct}\newblock
+  \usebibmacro{title}%
+  \newunit
+  \printlist{language}%
+  \newunit\newblock
+  \usebibmacro{byauthor}%
+  \newunit\newblock
+  \usebibmacro{in:}%
+  \usebibmacro{maintitle+booktitle}%
+  \newunit\newblock
+  \usebibmacro{series+number}%
+  \newunit\newblock
+  \usebibmacro{byeditor+others}%
+  \newunit\newblock
+  \printfield{edition}%
+  \newunit
+  \iffieldundef{maintitle}
+    {\printfield{volume}%
+     \printfield{part}}
+    {}%
+  \newunit
+  \printfield{volumes}%
+  \newunit\newblock
+  \printfield{note}%
+  \newunit\newblock
+  \usebibmacro{publisher+location+date}%
+  \newunit\newblock
+  \usebibmacro{chapter+pages}%
+  \newunit\newblock
+  \iftoggle{bbx:isbn}
+    {\printfield{isbn}}
+    {}%
+  \newunit\newblock
+  \usebibmacro{doi+eprint+url}%
+  \newunit\newblock
+  \usebibmacro{addendum+pubstate}%
+  \setunit{\bibpagerefpunct}\newblock
+  \usebibmacro{pageref}%
+  \newunit\newblock
+  \iftoggle{bbx:related}
+    {\usebibmacro{related:init}%
+     \usebibmacro{related}}
+    {}%
+  \usebibmacro{finentry}}
+
+\DeclareBibliographyDriver{inproceedings}{%
+  \usebibmacro{bibindex}%
+  \usebibmacro{begentry}%
+  \usebibmacro{author/translator+others}%
+  \setunit{\labelnamepunct}\newblock
+  \usebibmacro{title}%
+  \newunit
+  \printlist{language}%
+  \newunit\newblock
+  \usebibmacro{byauthor}%
+  \newunit\newblock
+  \usebibmacro{maintitle+booktitle(inproceedings)}%
+  \midsentence
+  \newunit\newblock
+  \usebibmacro{event+venue+date}%
+  \newunit\newblock
+  \usebibmacro{byeditor+others}%
+  \newunit\newblock
+  \printfield{volumes}%
+  \newunit\newblock
+  \usebibmacro{series+number}%
+  \newunit\newblock
+  \printfield{note}%
+  \newunit\newblock
+  \printlist{organization}%
+  \newunit\newblock
+  \usebibmacro{volume+part}%
+  \newunit
+  \usebibmacro{publisher+location+date}%
+  \newunit\newblock
+  \usebibmacro{chapter+pages}%
+  \newunit\newblock
+  \iftoggle{bbx:isbn}
+    {\printfield{isbn}}
+    {}%
+  \newunit\newblock
+  \usebibmacro{doi+eprint+url}%
+  \newunit\newblock
+  \usebibmacro{addendum+pubstate}%
+  \setunit{\bibpagerefpunct}\newblock
+  \usebibmacro{pageref}%
+  \newunit\newblock
+  \iftoggle{bbx:related}
+    {\usebibmacro{related:init}%
+     \usebibmacro{related}}
+    {}%
+  \usebibmacro{finentry}}
+
+\DeclareBibliographyDriver{online}{%
+  \usebibmacro{bibindex}%
+  \usebibmacro{begentry}%
+  \usebibmacro{author/editor+others/translator+others}%
+  \setunit{\adddot\addspace}%
+  \printtext[parens]{\usebibmacro{date}}%
+  \setunit{\adddot\addspace}%
+  \usebibmacro{title}%
+  \setunit{\adddot\addspace}%
+  \printlist{language}%
+  \setunit{\adddot\addspace}%
+  \usebibmacro{byauthor}%
+  \setunit{\adddot\addspace}%
+  \usebibmacro{byeditor+others}%
+  \setunit{\adddot\addspace}%
+  \printfield{version}%
+  \setunit{\adddot\addspace}%
+  \printfield{note}%
+  \newunit\newblock
+  \printlist{organization}%
+  \setunit{\adddot\addspace}%
+  \iftoggle{bbx:eprint}
+    {\usebibmacro{eprint}}
+    {}%
+  \newunit\newblock
+  \usebibmacro{url+urldate}%
+  \setunit{\adddot\addspace}%
+  \usebibmacro{addendum+pubstate}%
+  \setunit{\bibpagerefpunct}\newblock
+  \usebibmacro{pageref}%
+  \newunit\newblock
+  \iftoggle{bbx:related}
+    {\usebibmacro{related:init}%
+     \usebibmacro{related}}
+    {}%
+  \usebibmacro{finentry}}
+
+\DeclareBibliographyDriver{patent}{%
+  \usebibmacro{bibindex}%
+  \usebibmacro{begentry}%
+  \usebibmacro{author}%
+  \setunit{\labelnamepunct}\newblock
+  \usebibmacro{title}%
+  \newunit
+  \printlist{language}%
+  \newunit\newblock
+  \usebibmacro{byauthor}%
+  \newunit\newblock
+  \printfield{type}%
+  \setunit*{\addspace}%
+  \printfield{number}%
+  \newunit\newblock
+  \printfield{note}%
+  \newunit\newblock
+  \usebibmacro{date}%
+  \newunit\newblock
+  \usebibmacro{doi+eprint+url}%
+  \newunit\newblock
+  \usebibmacro{addendum+pubstate}%
+  \setunit{\bibpagerefpunct}\newblock
+  \usebibmacro{pageref}%
+  \newunit\newblock
+  \iftoggle{bbx:related}
+    {\usebibmacro{related:init}%
+     \usebibmacro{related}}
+    {}%
+  \usebibmacro{finentry}}
+
+\DeclareBibliographyDriver{report}{%
+  \usebibmacro{bibindex}%
+  \usebibmacro{begentry}%
+  \usebibmacro{author}%
+  \setunit{\labelnamepunct}\newblock
+  \usebibmacro{title}%
+  \newunit
+  \printlist{language}%
+  \newunit\newblock
+  \usebibmacro{byauthor}%
+  \newunit\newblock
+  \usebibmacro{institution+location}%
+  \newunit\newblock
+  \printfield{type}%
+  \setunit*{\addspace}%
+  \printfield{number}%
+  \newunit\newblock
+  \printfield{version}%
+  \newunit\newblock
+  \usebibmacro{date}%
+  \newunit
+  \printfield{note}%
+  \newunit\newblock
+  \usebibmacro{chapter+pages}%
+  \newunit
+  \printfield{pagetotal}%
+  \newunit\newblock
+  \iftoggle{bbx:isbn}
+    {\printfield{isrn}}
+    {}%
+  \newunit\newblock
+  \usebibmacro{doi+eprint+url}%
+  \newunit\newblock
+  \usebibmacro{addendum+pubstate}%
+  \setunit{\bibpagerefpunct}\newblock
+  \usebibmacro{pageref}%
+  \newunit\newblock
+  \iftoggle{bbx:related}
+    {\usebibmacro{related:init}%
+     \usebibmacro{related}}
+    {}%
+  \usebibmacro{finentry}}
+
+%%
+%% Copyright (C) 2011-2013,2015-2018 by
+%%   Joseph Wright <joseph.wright@morningstar2.co.uk>
+%%
+%% It may be distributed and/or modified under the conditions of
+%% the LaTeX Project Public License (LPPL), either version 1.3c of
+%% this license or (at your option) any later version.  The latest
+%% version of this license is in the file:
+%%
+%%    http://www.latex-project.org/lppl.txt
+%%
+%% This work is "maintained" (as per LPPL maintenance status) by
+%%   Joseph Wright.
+%%
+%% This work consists of the files biblatex-ieee.bib,
+%%                                 biblatex-ieee.tex,
+%%                                 ieee.bbx,
+%%                                 ieee.cbx,
+%%                                 ieee-alphabetic.bbx,
+%%                                 ieee-alphabetic.cbx and
+%%                                 magyar-ieee.lbx,
+%%           and the derived files biblatex-ieee.pdf and
+%%                                 biblatex-ieee-alphabetic.pdf.
+%%
+%%
+%% End of file `ieee.bbx'.
diff --git a/macros/latex/contrib/biblatex-contrib/biblatex-ieee/ieee.cbx b/macros/latex/contrib/biblatex-contrib/biblatex-ieee/ieee.cbx
new file mode 100644
index 0000000000..3d31f8ebdf
--- /dev/null
+++ b/macros/latex/contrib/biblatex-contrib/biblatex-ieee/ieee.cbx
@@ -0,0 +1,88 @@
+%% ---------------------------------------------------------------
+%% biblatex-ieee --- A biblatex implementation of the IEEE 
+%%   bibliography style
+%% Maintained by Joseph Wright
+%% E-mail: joseph.wright@morningstar2.co.uk
+%% Released under the LaTeX Project Public License v1.3c or later
+%% See http://www.latex-project.org/lppl.txt
+%% ---------------------------------------------------------------
+%% 
+
+\ProvidesFile{ieee.cbx}[2019/06/19 v1.3a biblatex citation style]
+
+\RequireCitationStyle{numeric-comp}
+
+\ExecuteBibliographyOptions{
+    maxcitenames = 3,
+    minnames     = 3,
+    sorting      = none
+}
+
+% Putting brackets around each citation number is a two-part
+% operation. First, remove them from around the whole citation by
+% redeclaring here.
+\DeclareCiteCommand{\cite}%
+  {\usebibmacro{cite:init}%
+   \bibopenbracket
+   \usebibmacro{prenote}}
+  {\usebibmacro{citeindex}%
+   \usebibmacro{cite:comp}}
+  {}
+  {\usebibmacro{cite:dump}%
+   \usebibmacro{postnote}%
+   \bibclosebracket
+  }
+
+% The second step is to replace \multicitedelim with a version wrapped in
+% the appropriate delimiter.
+\renewcommand*{\do}[1]{%
+  \expandafter\patchcmd\expandafter
+    {\csname abx@macro@\detokenize{#1}\endcsname}%
+    {\multicitedelim}
+    {\bibclosebracket\multicitedelim\bibopenbracket}
+    {}
+    {%
+      \PackageError{biblatex-ieee}{Failed to update citation style}\@ehc
+    }%
+  }
+\docsvlist{cite:comp:comp,cite:comp:end,cite:comp:inset,cite:dump}
+
+% There's also one \bibrangedash to alter.
+\expandafter\patchcmd\expandafter
+  {\csname abx@macro@\detokenize{cite:dump}\endcsname}%
+  {\bibrangedash}
+  {\bibclosebracket\bibrangedash\bibopenbracket}
+  {}
+  {%
+    \PackageError{biblatex-ieee}{Failed to update citation style}\@ehc
+  }%
+
+% More bracket removal required
+\DeclareMultiCiteCommand{\cites}{\cite}{\multicitedelim}
+
+%% 
+%% Copyright (C) 2011-2013,2015-2018 by
+%%   Joseph Wright <joseph.wright@morningstar2.co.uk>
+%% 
+%% It may be distributed and/or modified under the conditions of
+%% the LaTeX Project Public License (LPPL), either version 1.3c of
+%% this license or (at your option) any later version.  The latest
+%% version of this license is in the file:
+%% 
+%%    http://www.latex-project.org/lppl.txt
+%% 
+%% This work is "maintained" (as per LPPL maintenance status) by
+%%   Joseph Wright.
+%% 
+%% This work consists of the files biblatex-ieee.bib,
+%%                                 biblatex-ieee.tex,
+%%                                 ieee.bbx,
+%%                                 ieee.cbx,
+%%                                 ieee-alphabetic.bbx,
+%%                                 ieee-alphabetic.cbx and
+%%                                 magyar-ieee.lbx,
+%%           and the derived files biblatex-ieee.pdf and
+%%                                 biblatex-ieee-alphabetic.pdf.
+%% 
+%%
+%% End of file `ieee.cbx'.
diff --git a/macros/latex/contrib/biblatex-contrib/biblatex-ieee/magyar-ieee.lbx b/macros/latex/contrib/biblatex-contrib/biblatex-ieee/magyar-ieee.lbx
new file mode 100644
index 0000000000..52f87d1bb7
--- /dev/null
+++ b/macros/latex/contrib/biblatex-contrib/biblatex-ieee/magyar-ieee.lbx
@@ -0,0 +1,60 @@
+%% ---------------------------------------------------------------
+%% biblatex-ieee --- A biblatex implementation of the IEEE 
+%%   bibliography style
+%% Maintained by Joseph Wright
+%% E-mail: joseph.wright at morningstar2.co.uk
+%% Released under the LaTeX Project Public License v1.3c or later
+%% See http://www.latex-project.org/lppl.txt
+%% ---------------------------------------------------------------
+%% 
+
+\ProvidesFile{magyar-ieee.lbx}
+\InheritBibliographyExtras{magyar}
+
+\DeclareBibliographyStrings{inherit={magyar}}
+
+\DeclareBibliographyExtras{
+  \savefieldformat{number}%
+  \savefieldformat{volume}%
+  \savefieldformat{series}%
+  \DeclareFieldFormat[article, periodical]{number}{\mkbibordinal{#1}\addnbspace\bibstring{number}}%
+  \DeclareFieldFormat[book,inbook,incollection,inproceedings]{series}{%
+    \ifnumerals{#1}{\mkbibordinal{#1}}{#1}\addnbspace\bibstring{jourser}}%
+  \DeclareFieldFormat*{volume}{%
+    \ifnumerals{#1}{\mkbibordinal{#1}}{#1}\addnbspace\bibstring{volume}}%
+  \DeclareFieldFormat[article,periodical]{volume}{%
+    \ifnumerals{#1}{\mkbibordinal{#1}}{#1}\addnbspace\bibstring{jourvol}}%
+}
+
+\UndeclareBibliographyExtras{%
+  \restorefieldformat{volume}%
+  \restorefieldformat{number}%
+  \restorefieldformat{series}%
+}
+
+%% 
+%% Copyright (C) 2011-2013,2015-2018 by
+%%   Joseph Wright <joseph.wright at morningstar2.co.uk>
+%% 
+%% It may be distributed and/or modified under the conditions of
+%% the LaTeX Project Public License (LPPL), either version 1.3c of
+%% this license or (at your option) any later version.  The latest
+%% version of this license is in the file:
+%% 
+%%    http://www.latex-project.org/lppl.txt
+%% 
+%% This work is "maintained" (as per LPPL maintenance status) by
+%%   Joseph Wright.
+%% 
+%% This work consists of the files biblatex-ieee.bib,
+%%                                 biblatex-ieee.tex,
+%%                                 ieee.bbx,
+%%                                 ieee.cbx,
+%%                                 ieee-alphabetic.bbx,
+%%                                 ieee-alphabetic.cbx and
+%%                                 magyar-ieee.lbx,
+%%           and the derived files biblatex-ieee.pdf and
+%%                                 biblatex-ieee-alphabetic.pdf.
+%% 
+%%
+%% End of file `biblatex-ieee.bib'.
\ No newline at end of file