Abstract
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\medskip\textsc{#1}\\
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%list here necessary packages, for example
\usepackage{amssymb, amsmath}
\begin{document}
\title{Title} %title of presentation
\author{A.\ Author}%author's name
{University, City}%author's university
{address@abc} %author's e-mail address
\index{Author A.}%Author A.
\begin{abstract}%abstract text
\medskip
{\footnotesize \begin{enumerate} \item %references
\end{enumerate}}
\end{abstract}
\end{document}