\documentclass[12pt]{amsart}
\usepackage{amsfonts}

\usepackage{amscd,amssymb,amsthm,amsmath,mathrsfs}
\usepackage[pdftex]{graphicx}
\usepackage{times}
\usepackage{color}
%\usepackage{rgmiaprob}
\usepackage{hyperref}
\setlength{\paperwidth}{210mm}
\setlength{\paperheight}{210mm}
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%\issueinfo{??}{2008}
%\dateinfo{???}
%\copyrightinfo{2008}{Victoria University}
%\code{RGMIA-pc-9-08}
%\authored{A.U. Thor}


\begin{document}
\title{}
\author{A.U. Thor}
\address{\hspace{-12pt}\parbox{\textwidth}{
Address line 1\\
Address line 2\\
Address line 3\\[-5pt]}}
\email{author@math.edu.au}


\maketitle


This is the RGMIA Problem Corner Template. 
\begin{equation*}
g(x):=\sum^\infty_{n=1}\lambda_n\sin nx,\quad \text{un-numbered equation}
\end{equation*}
and
\begin{equation}
f(x):=\sum^\infty_{n=1}\lambda_n\cos nx. \quad \text{labelled equation}
\label{whatever}
\end{equation}

This is how to refer \eqref{whatever} (or (\ref{whatever})) to an equation.

See also \cite{1b} and \cite[p. 67]{2bfwrf} below for examples for references.


\begin{thebibliography}{9}
\bibitem{1b} A.U. THOR1 \textsc{and} A.U. THOR2, Title of the paper, \textit{Title of the journal}, \textbf{vol }(year), 1stPage--lastPage.

\bibitem{2bfwrf} A.U. THOR, \textit{Title of Book}, Publisher, Place, Year.
\end{thebibliography}

\end{document}