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+%%
+%% An UIT Edition example
+%%
+%% Example 03-05-3 on page 26.
+%%
+%% Copyright (C) 2010 Herbert Voss
+%%
+%% It may be distributed and/or modified under the conditions
+%% of the LaTeX Project Public License, either version 1.3
+%% of this license or (at your option) any later version.
+%%
+%% See http://www.latex-project.org/lppl.txt for details.
+%%
+%%
+%% ====
+% Show page(s) 1
+%%
+\documentclass[]{exaarticle}
+\pagestyle{empty}
+\setlength\textwidth{375.57637pt}
+\setlength\parindent{0pt}
+\usepackage[utf8]{inputenc}
+\setcounter{equation}{27}
+\renewcommand\theequation{3.\arabic{equation}}\setlength\parskip{1ex plus 0.2ex}
+\StartShownPreambleCommands
+
+\StopShownPreambleCommands
+\begin{document}
+\begin{equation}
+ f(x)=\int_1^{\infty}\frac{1}{x^2}\mathrm{d}x=1
+\end{equation}\renewcommand*\theequation{*}
+%
+\begin{equation}\label{eq:*}
+ f(x)=\int_1^{\infty}\frac{1}{x^2}\mathrm{d}x=1
+\end{equation}
+%
+When we want to refer to the equation labelled with a star we use
+\verb+\ref{eq:*}+ in the coding and this results in
+\ref{eq:*} --- the star is output correctly in the text.
+\end{document}