%\documentclass[aps,prl,twocolumn,showpacs,superscriptaddress]{revtex4}
\documentclass[12pt]{article}
\begin{document}
\title{An Example Manuscript}
\author{Cemal Yalabik}
\date{\today}
\maketitle
\abstract{This is where I put a summary of what I have written about}
\section{This is the First Section}
Things I write in the first section
\section{Second Section}
\subsection{A subsection}
This is an example of a subsection.

\begin{equation}
\overline p(n_1) = \sum_{n_1 > n_2} p(n_1,n_2) .
\label{p-one}
\end{equation}

consistent with the results of Prusner\cite{Prusner} as shown in Eqn.\ref{p-one}


\begin{thebibliography}{9}
\bibitem{Evans} Evans article.
\bibitem{Prusner} Prusner article.
\bibitem{Ma} Ma article.

\end{thebibliography}

\end{document}