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\documentclass[a4paper,11pt]{article}

\usepackage[T1]{fontenc}
\usepackage[latin1]{inputenc}
\usepackage{amsmath,amsfonts,amssymb,epsfig,graphicx,url,color}
\usepackage[english]{babel}
\usepackage{geometry}
\geometry{a4paper,textwidth=17cm,textheight=26cm}
 \newcommand{\diag}{\mathop{\mathrm{diag}}}
\usepackage{authblk}
\renewcommand*{\Affilfont}{\it}
\renewcommand*{\Authfont}{\bfseries}    

\thispagestyle{empty}
\renewcommand{\bfdefault}{b}
\setlength\parindent{0pt}
\setlength\itemsep{-10pt}
\baselineskip 0pt
\date{}
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% PLEASE, DO NOT MODIFY THE PART ABOVE
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\begin{document}

% AUTHORS AND AFFILIATIONS
\title{Title of the talk}
\author[1]{First Author}
\author[1]{Second Author}
\author[2]{\underline{Third Author} }
\affil[1]{Affiliation first, {\tt email@ }}
\affil[2]{Affiliation second,
     {\tt email@ }}
 
\maketitle
\thispagestyle{empty}

% abstract text
Abstract text...
 

% BIBLIOGRAPHY  

\end{document}
