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\begin{document}
\begin{center}
{\bf \large Title of the talk}

\medskip
{Name Surname of the author}

\medskip
{\it 
affiliation}\\
{ \tt email@address}%
\end{center}

\medskip
Body of the abstract

\vspace{5mm} \noindent{\bf Acknowledgment}\\ This work was
supported by ... (not compulsory)
\begin{thebibliography}{99}
\bibitem{P1} Author(s), Title of the paper, {\bf Journal},
issue (year), pages. %
\bibitem{B1} Author(s), Title of a monograph, Printing House, year.
\end{thebibliography}
\end{document}