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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}