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\documentclass[a4paper,11pt]{article}
\usepackage[latin1]{inputenc}
\usepackage[english]{babel}
\usepackage{graphicx,amsmath,amsfonts,amssymb,a4wide}

\newenvironment{vuoto}{}{}
\newenvironment{abst}{
\textbf{Abstract}\begin{vuoto}}{
\end{vuoto}}

\newenvironment{keyw}{
\textbf{Keywords:}\begin{vuoto}}{
\end{vuoto}}



\newcommand{\papertitle}[1]{%
\begin{center}
\LARGE \textbf{#1} \\
\vspace*{0.5cm}
}
\newcommand{\session}[1]{%
\newpage
\begin{center}
%\Large 
\textit{#1} \\
\end{center}
\vspace*{0.5cm}
}
\newcommand{\presentername}[1]{%
\normalsize
\textbf{#1}$^*$ \\
}
\newcommand{\presenteraffiliation}[2]{%
\normalsize \emph{#1}, \texttt{#2} \\
\vspace*{1ex} 
}
\newcommand{\coauthorname}[1]{%
\normalsize
\textbf{#1} \\
}
\newcommand{\coauthoraffiliation}[2]{%
\normalsize \emph{#1}, \texttt{#2} \\
\vspace*{1ex}
}
\newcommand{\paperabstract}[1]{%
\setcounter{figure}{0}
\end{center}
\begin{abst}
\normalsize #1
\end{abst}
\vspace*{1ex}
}



\newcommand{\paperkeywords}[1]{%
\begin{keyw}
\normalsize \emph{#1}
\end{keyw}
\vspace*{1ex}
}





\newenvironment{papertext}{}

\newcommand{\vref}[1]{
\item #1
}
\newcommand{\paperreferences}[1]{%
~\\
\noindent \large \textbf{References}
\renewcommand{\theenumi}{[\arabic{enumi}]}
\renewcommand{\labelenumi}{\theenumi}
\begin{enumerate}
\normalsize
#1
\end{enumerate}
\newpage
}

\begin{document}

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%------- Session of the talk (invited or contributed)
\session{Session ``Title of the Session'' invited by Name Surname \\ or \\ Contributed session}
%------- Title of the talk
\papertitle{Title of the Talk}
%------- Speaker
\presentername{SpeakerName SpeakerSurname\index{SpeakerSurname, SpeakerName|pp}}
\presenteraffiliation{Department of , University of }{email address}
%------- Coauthor 1
\coauthorname{CoauthorName CoauthorSurname\index{CoauthorSurname, CoauthorName|ca}}
\coauthoraffiliation{Department of , University of }{email address}
%------- Coauthor 2
%\coauthorname{\index{|ca}}
%\coauthoraffiliation{}


%------- Abstract (max 3 pages)
\paperabstract{
This is an example of the short abstract template (max 3 pages) and how to cite (max 3) references \ref{CY59}, \ref{CP61}.}

\paperkeywords{keyword1, keyword2, keyword3}

%------- References
\paperreferences{
\vref{\label{CY59} Civin, P., and B. Yood, \emph{Involutions on Banach algebras}, Pacific J. Math. \textbf{9} (1959), 415--436.}

\vref{\label{CP61} Clifford, A. H., and G. B. Preston, ``The Algebraic Theory of Semigroups,'' Math. Surveys \textbf{7}, Amer. Math. Soc., Providence, R.I., 1961.}

}




\end{document}

