\documentclass[10pt]{article}
\textwidth=108mm
\textheight=168mm
\usepackage[T2A]{fontenc}
\usepackage[cp1251]{inputenc}
\usepackage[english,russian,ukrainian]{babel}
\usepackage{amsmath,amssymb,latexsym,enumerate}
\def\title#1{{\centering\large\textbf{#1}\par\vspace{1ex}}}
\def\authors#1{{\centering\textit{#1}\par\vspace{1ex}}}
\def\email#1{{\centering\texttt{#1}\par}}
\def\address#1{{\centering\textit{#1}\par\vspace{2ex}}}

\begin{document}%-------------------------------------

\title{TITLE OF THE REPORT}

\authors{Author N. S., Author N. S.}

\email{mail1@email.com, mail2@email.com}

\address{Uzhhorod National University, Ukraine}

%TEXT

%Abstracts of the report (until 1 page) are submitted in the LaTeX format.
%The text is drawn up in accordance with the requirements of the file.
%Abstracts that don't meet the requirements for publication are not accepted.

%The end of the text.

%Literature, if it's required, after the text.

\begin{enumerate}[1.]
\itemsep=-.5ex
\item Перше посилання
\item Друге посилання
\end{enumerate}
\end{document}

