%%%
%%% Modify appropriately only the text between \begin{document} and \end{document}.
%%%

\documentclass[10pt,twoside]{article}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsthm} 

\textwidth=122mm
\textheight=193mm
\headsep=7.2mm
\headheight=7mm

\topmargin=17mm
\evensidemargin=19mm %-2
\oddsidemargin=18.5mm %12

\makeatletter
\renewenvironment{thebibliography}[1]
      {\list{\@biblabel{\@arabic\c@enumiv}}%
           {\settowidth\labelwidth{\@biblabel{#1}}%
            \leftmargin\labelwidth
            \advance\leftmargin\labelsep
            \@openbib@code
            \usecounter{enumiv}%
            \let\p@enumiv\@empty
            \renewcommand\theenumiv{\@arabic\c@enumiv}}%
      \sloppy
      \clubpenalty4000
      \@clubpenalty \clubpenalty
      \widowpenalty4000%
      \sfcode`\.\@m}
     {\def\@noitemerr
       {\@latex@warning{Empty `thebibliography' environment}}%
      \endlist}

\makeatother

\renewcommand{\baselinestretch}{1.2}

\newcommand{\equadifftitle}[1]{ 
 \begin{center}
  {\bfseries\uppercase{#1}}
 \end{center}
 \vspace{-1\baselineskip}}


\newcommand{\equadiffauthor}[3]{
%\index{#4@{\bfseries #2} #1}
 \begin{center}
  {\bfseries #1 #2}, {\itshape #3}
 \end{center}
 \vspace{0\baselineskip}}

\begin{document}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%% Here is the place for your abstract (begin) %%%
%%% ------------------------------------------- %%%


\equadifftitle{here is the title of your abstract. after compiling it will be automatically in capitals}
\equadiffauthor{Firstname}{Surname}{City, Country}

{\small \noindent \textbf{2000 MSC:} 34C10}\\[-4mm]
%\vskip\baselineskip


This is a joint work with Prof XY. Here is the text of your abstract. Here is the text of your abstract.
Here is the text of your abstract. Here is the text of your abstract. Here is the text of your abstract.  

Here is some equation
\begin{equation}
\label{YourSurname:1}
y'=-f(t,y).
\end{equation}
As a label of \eqref{YourSurname:1}, please, use your surname 
followed by ``:'' and a number of the equation.
The same principle use for references, if any, e.g.
\cite{YourSurname:book1} and \cite{YourSurname:article1}.
After compiling the source file, the abstract should not exceed 1/2 of this B5 format.
\vskip\baselineskip

{\small
\begin{thebibliography}{9}

\bibitem{YourSurname:book1} P. Hartman, 
Ordinary differential equations. John Wiley, New York, 1964.

\bibitem{YourSurname:article1} E. Kamke, 
\textit{Zur theorie der systeme gew\"ohnlicher differentialgleichungen, II.} 
Acta Math. \textbf{58} (1932), 57--85.

\end{thebibliography}
}

%%% ------------------------------------------- %%%
%%% Here is the place for your abstract (end)   %%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


\end{document}