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\begin{center}
\textsf{\textbf{\Large title of abstract}} \\[0.5cm]
\textbf{name surname$^{1}$, \underline{name surname}$^{2}$} \\[0.2cm]
$^{1}$\textit{address (department, University, city, country)} \\[0.05cm]
\textit{E-mail:} \textsf{email address} \\[0.15cm]
$^{2}$\textit{Department, University, city, country} \\[0.05cm]
\textit{E-mail:} \textsf{email address}
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text of abstract
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\noindent \textbf{Theorem 1\;\;} \textit{text of theorem}
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\noindent \textbf{Lemma 1\;\;} \textit{text of lemma}
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\noindent \textbf{Definition\;\;} text of definition
\subsection*{Acknowledgments}
The work was supported by the ...
\subsection*{References}
\begin{enumerate}
\item[{[1]}] O. Chkadua, S. E. Mikhailov and D. Natroshvili, Analysis of direct boundary-domain integral equations for a mixed BVP with variable coefficient, I: equivalence and invertibility. \emph{J. Integral Equations Appl.} \textbf{21} (2009), no. 4, 499-543.
\vspace{-5pt}
\item[{[2]}] L. Grafakos and A. Meskhi, On sharp Olsen’s and trace inequalities for multilinear fractional integrals. \emph{Potential Anal.} (2022),
https://doi.org/10.1007/s11118-022-09991-y.
\vspace{-5pt}
\item[{[3]}] Z. A. Kvatadze and T. L. Shervashidze, On limit theorems for conditionally independent random variables controlled by a finite Markov chain. \emph{Probability theory and mathematical statistics (Kyoto, 1986)}, 250--258, Lecture Notes in Math., 1299, Springer, Berlin, 1988.
\vspace{-5pt}
\item[{[4]}] L. G. Loitsansky, \textit{Mechanic of a fluid and gas}. (Russian) Sciences, Moscow, 1987.
\end{enumerate}
\end{document}