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\newcommand{\bc}{\begin{center}}
\newcommand{\ec}{\end{center}}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{amsfonts}
\usepackage{amsthm}

\newtheorem{theorem}{Theorem}[section]
\newtheorem{definition}{Definition}[section]
\newtheorem{example}{Example}[section]
\newtheorem{lemma}{Lemma}[section]
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\begin{document}

\bc
\textbf{Title of the lecture}
\ec

\medskip

\bc
AUTHOR1$^*$, AUTHOR2$^*$ 
\ec

\date{}

\medskip
\medskip

\bc
{\footnotesize \noindent $^{*}$ Affiliation 1, Country 1\\
E-mail: email address 1 \\

\medskip

\noindent $^{**}$ Affiliation 2, Country 2\\
E-mail: email address 2 \\
}
\ec

\bigskip

The text of the abstract ....



\begin{thebibliography}{99}
\bibitem{book-label} Authors, \textit{Book's title}, Publisher, Address, year.

\bibitem{article-label} Authors, Article title, \textit{Journal},
\textbf{Volume}(year), first page-last page.

\end{thebibliography}



\end{document}
