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\begin{document}
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\title{UPPER CASE}
\author{Name  FAMILYNAME$^*$, Name  FAMILYNAME$^{**}$\footnote{Email of the corresponding author}, Name  FAMILYNAME$^*$\\$^*$Institution, Country.\\$^{**}$Institution, Country.}

\date{}


\maketitle

\thispagestyle{myheadingsio}\markboth{\footnotesize{
\underline{\rm\bf{REVISTA INVESTIGACI\'ON OPERACIONAL
\hspace{2.9in}Vol. XX, No. X, xxx-xxx, 20XX}}}}{\footnotesize{
\underline{\rm\bf{REVISTA INVESTIGACI\'ON OPERACIONAL
\hspace{2.9in}Vol. XX, No. X, xxx-xxx, 20XX}}}}

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\begin{resumen}{El resumen en espa\~nol.}\end{resumen}\palabrasclave{keyword 1, ...keyword X(between 3 and 5.}


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                             \section{ INTRODUCTION}             

We used \cite{einstein}. Refer to \cite{latexcompanion, knuthwebsite}


    \section{ UPPER-CASE}
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\section{CONCLUSIONS}


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