\documentclass[a4paper,twoside]{article}
\usepackage[T1]{fontenc}
\usepackage[utf8x]{inputenc}
\usepackage{srcltx}
%% \usepackage{synctex}
%% \usepackage{pdfsync}
%% \usepackage{url}

%% \usepackage{times}
%% \usepackage{courier}
%% \usepackage{helvet}

%% \usepackage{amsmath,amssymb,amsfonts}
%%\usepackage[printonlyused]{acronym}

%%\usepackage{cite}

%% \usepackage{graphicx}
%% \usepackage{graphics}
%% \graphicspath{{./}}
%% \newcommand{\reffig}[1]{Figure~\ref{fig:#1}}

%% \newcommand{\fig}[2]{
%%   \begin{figure}
%%     \begin{center}
%%       \includegraphics[width=11cm]{#1}
%%       \caption{#2}
%%       \label{fig:#1}
%%     \end{center}
%%   \end{figure}
%% }

\title{Key word test}
\author{Pedro A. Aranda Gutiérrez}

%% \setlength{\oddsidemargin}{1cm}
%% \setlength{\evensidemargin}{1cm}
%% \setlength{\textwidth}{14cm}
%% \setlength{\parindent}{0pt}
%% \setcounter{secnumdepth}{-1}

\begin{document}
%% \maketitle

%% \begin{abstract}
%% \end{abstract}

\keywords{Key word,test}

\section{Intro}
This is a simple file to test key words as used by Elsevier and others.

%% \bibliographystyle{unsrt} %%{abbrv}
%% \bibliography{}
\end{document}
