\documentclass[11pt]{article}
\usepackage{latexsym,amsthm,amsmath,amssymb}
\usepackage[utf8x]{inputenc}

\newtheorem{theorem}{Theorem}
\newtheorem{lemma}{Lemma}

\pagestyle{empty}
\setlength{\textheight}{22cm}
\setlength{\topmargin}{-1cm}
\setlength{\textwidth}{165mm}
\setlength{\oddsidemargin}{-3mm}
\setlength{\unitlength}{1mm}


%\renewcommand{\refname}{\small References}
%\addto{\captionsenglish}{\renewcommand{\refname}{\normalsize
  %  References}}

\renewcommand{\title}[1]{{\noindent\bf\Large #1}}
\newcommand{\speaker}[1]{\noindent\underline{\bf #1} }
\newcommand{\coauthor}[1]{{\noindent\bf#1 }}
\newcommand{\affiliation}[1]{{\noindent\bf --- #1 }}



%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%
%Put here the package you need, new commands, ...
% Avoid non standard stuff if possible ... 


%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%

\begin{document}
%4 pages max !! 


%Write your title here: 
\title{A result about graph}

\vspace{2ex}



% The speaker
\speaker{Bob Dylan}
\affiliation{Miscatonic University}

%A coauthor, add as many as needed
\coauthor{C. Berge}
\affiliation{RIP University}

%The order of authors is up to you.
%It will appear as you write it !


\vspace{2ex}


\begin{abstract}
1000 char max, (please cut and past this abstract to fill the field
``abstract'' on easychair when submitting). 
\end{abstract}


Present as you wish, for instance : this paper is about \cite{berge:60}, 

\begin{theorem}
Every non-empty graph has a vertex. 
\end{theorem}


%If you need a ref section, do it more or less like that : 
\small
\begin{thebibliography}{1}
\bibitem{berge:60}
C.~Berge.
\newblock Les probl\`emes de coloration en th\'eorie des graphes.
\newblock Technical report, Publ. Inst. Stat. Univ. Paris, 1960.
\end{thebibliography}
\end{document}