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\documentclass[11pt]{article}
%%\usepackage[cp1251]{inputenc}
%\usepackage[english,russian,ukrainian]{babel}
\pagestyle{empty}
\textwidth=11.3truecm
\textheight=16truecm
\topmargin-12mm\parskip4pt plus2pt minus2pt
\renewcommand{\title}[1]{\begin{center}\textbf{\large #1}\end{center}}
\renewcommand{\author}[3]{\begin{center} \medskip\textsc{#1}\\ \medskip\textit{#2}\\ \smallskip\textrm{#3}\end{center}}
\renewenvironment{abstract}{\noindent}{}
%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}