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+\documentclass[DIV=9, parskip=half, pagesize=auto]{scrartcl}
+
+\usepackage{fixltx2e}
+\usepackage{etex}
+\usepackage{xspace}
+\usepackage{lmodern}
+\usepackage[T1]{fontenc}
+\usepackage{textcomp}
+\usepackage{microtype}
+\usepackage[unicode=true]{hyperref}
+
+\newcommand*{\mail}[1]{\href{mailto:#1}{\texttt{#1}}}
+\newcommand*{\pkg}[1]{\textsf{#1}}
+\newcommand*{\cs}[1]{\texttt{\textbackslash#1}}
+\makeatletter
+\newcommand*{\cmd}[1]{\cs{\expandafter\@gobble\string#1}}
+\makeatother
+
+\addtokomafont{title}{\rmfamily}
+
+\title{The \pkg{circle} package}
+\author{Klaus G. Barthelmann, \mail{barthel@informatik.uni-mainz.de}}
+\date{1998/07/15}
+
+
+\begin{document}
+
+\maketitle
+
+As the name says, \cmd{\Circle} gives a circle in math mode. Its size lies between
+that of the binary operator \cmd{\circ} and that of the unary operator \cmd{\bigcirc}.
+It can be used as the nextstep operator of temporal logic in conjunction with
+\cmd{\Box} and \cmd{\Diamond} (\pkg{latexsym}) or \cmd{\square} and \cmd{\lozenge} (\pkg{amssymb}). \verb+\Circle[f]+
+gives a filled circle.
+
+As you probably know, L.~Lamport discouraged the use of the nextstep
+operator for program verification. This could be the reason that he did not
+provide a symbol for it in \LaTeX.
+
+The circles are taken from the \pkg{lcircle10} font. We try to choose the
+appropriate size. If you need a high quality output, this solution will not
+suit you.
+
+Bugs: circles have size $n$ at fontsize $2n-1$ and $2n$; they do not scale linearly
+depending on the fontsize
+
+\end{document}