\documentclass{article}

\arraycolsep 2pt

\def\textindent#1{\indent\llap{#1\enspace}\ignorespaces}
\def\bibitem{\vskip2pt\par\hangindent=\parindent\textindent}

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\begin{document}



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%%%%%%%%%%%%%%%%%%%%%%%% begin of your informations 
%%%% 1 (no longer) - Book of Abstracts ODAM 2019



\def\firstname{Firstname}
\def\surname{Surname}
%%% second author 
\def\firstnamee{Firstname2}
\def\surnamee{Surname2}
%\def\firstnamee{\relax}
%\def\surnamee{\relax}
%%% third author
\def\firstnameee{\relax}
\def\surnameee{\relax}
%% fourth author
\def\firstnameeee{\relax}
\def\surnameeee{\relax}



\long\def\address{%%% Address
Affiliation,  Street, Town, Country}
%%% second address
\long\def\addresse{Affiliation2,  Street2, Town2, Country2}
%\long\def\addresse{\relax}
%%% third address
\long\def\addressee{\relax}
%% fourth address
\long\def\addresseee{\relax}



\def\email{email@address}
\def\emaile{email2@address}
%\def\emaile{\relax}
\def\emailee{\relax}
\def\emaileee{\relax}




%%%%% Title
\long\def\title{Title of the Paper\\ Second Line}





\long\def\abstract{%%%%%%% Abstract begin
Text, text, text, text, text, text, text, text, text, text, text, text, text, text, text, text.
Text, text, text, text, text, text, text, text, text, text, text, text, text, text, text, text.
Text, text, text, text, text, text, text, text, text, text, text, text, text, text, text, text.
Text, text, text, text, text, text, text, text, text, text, text, text, text, text, text, text.
Text, text, text, text, text, text, text, text, text, text, text, text, text, text, text, text.



Text, text, text, text, text, text, text, text, text, text, text, text, text, text, text, text.
Text, text, text, text, text, text, text, text, text, text, text, text, text, text, text, text.
Text, text, text, text, text, text, text, text, text, text, text, text, text, text, text, text.
Text, text, text, text, text, text, text, text, text, text, text, text, text, text, text, text.
Text, text, text, text, text, text, text, text, text, text, text, text, text, text, text, text.

%%%%% Abstract end
}



\long\def\References{%%%%%%%%%%%%%%%%%%%%
\bibitem{[1]} Name1, X.: Title of article.   
\emph{Journal}  {\bf vol.}, number (year), first page--last page.

\bibitem{[2]} Name1, X.: Title of article.   
\emph{Journal}  {\bf vol.} (year), first page--last page.

\bibitem{[3]} Name1, X., Name2, Y.: \emph{Title of Book}. Publisher, address, year.
}



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% end of author's part
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%%% displayed text

\vspace{\baselineskip}
\begin{center}

{\bfseries\Large\title}

\vspace{0.75\baselineskip}

{\large\bfseries \firstname\ \surname
\if\firstnamee\relax\else  \footnotemark ,\ \firstnamee~\surnamee \footnotemark  \fi
\if\firstnameee\relax\else  ,\ \firstnameee~\surnameee \footnotemark \fi
\if\firstnameeee\relax\else   ,\ \firstnameeee~\surnameeee \footnotemark \fi
}

\vspace{0.75\baselineskip}

\setcounter{footnote}{0}
\if\addresse\relax\else\footnotemark \fi {\itshape \address \\  \upshape e-mail: \email
 
\if\addresse\relax\else \par \footnotemark \itshape \addresse \\  \upshape e-mail: \emaile \fi
\if\addressee\relax\else \par \footnotemark\itshape \addressee \\  \upshape e-mail: \emailee \fi
\if\addresseee\relax\else \par \footnotemark\itshape \addresseee \\  \upshape e-mail: \emaileee \fi

}

\end{center}

\vspace{0.5\baselineskip}

\noindent\abstract

\vspace{0.5\baselineskip}


\noindent
\textbf{References:} \References




\end{document}