\documentclass[]{article}
\oddsidemargin -10 mm
\topmargin -11 mm
\textheight 225 mm
\textwidth 178 mm
\begin{document}

% Top matter
%---------------------------------------------------------------------------------------------------------------
\begin{flushleft}
{\Large\bf TITLE OF CONTRIBUTION}\\ \vspace {5mm}

{\large An Author} {\it Institution, Country}\\
%Please put the name of the person who will give the talk in
%boldface
{\large \bfseries An AUTHOR}  % speaker, the family name should be writen in capital characters
{\it Institution, Country}, E-mail: email address\\
{\large  An Author}   {\it Institution, Country}\\
\ldots\\  \vspace{3mm}

{\sc Key words\/}: \ldots\\  \vspace{3mm}

{\sc Mathematical Subject Classification}: \ldots
\end{flushleft}

% Abstract
%---------------------------------------------------------------------------------------------------------------
\vspace{3mm}
\noindent{\bf Abstract}:  You can insert your abstract here \ldots

\medskip
Do not forget that the length of the abstract including references
{\bf cannot exceed one page!!!}

\medskip
Please, avoid using your personal macros!!!

%References
%---------------------------------------------------------------------------------------------------------------
\vspace*{5mm}
\noindent{\large\bf References}
\medskip
\renewcommand{\labelenumi}{[\arabic{enumi}]}
\begin{enumerate}
\item Author, Author \ldots \& Author (Year). Title, {\it Journal}, {\bf Volume}, start page-end page.
%The Author's name should be in the format as first charecter. Family name, such as F.Y. Wang, I. Gentil
\item Author, Author \ldots \& Author (Year). Title, {\it Journal}, {\bf Volume}, start page-end page.
\item \ldots

\end{enumerate}

\end{document}
