\documentclass[preprint,12pt,authoryear]{elsarticle}

\usepackage{lineno,hyperref}
\usepackage{amsmath,amssymb}
\usepackage{tabularx}
\usepackage{multirow}
\usepackage[utf8]{inputenc}
\usepackage{graphicx}
\usepackage{caption}
\usepackage[table]{xcolor}
\usepackage{colortbl}
\usepackage{float}
\usepackage{array}
\usepackage{graphicx}
\usepackage{natbib}


\bibliographystyle{elsarticle-num-names}

\begin{document}

\begin{frontmatter}


\title{Robust optimization }



\begin{abstract}
This paper develops robust optimization for the supplier selection problem and applies the fish swarm algorithm as solution procedure. 
\end{abstract}



\begin{keyword}
Supplier portfolio optimization\sep Gray wolf algorithm\sep Artificial fish swarm algorithm\sep Risk\sep Robust optimization.\\
\end{keyword}

\end{frontmatter}

%% \linenumbers

%% main text
\section{Introduction}
\label{Intro}
Chain management includes communication and collaboration between chain members. These members can be suppliers, intermediaries, customers, etc. \cite{rushton2014handbook}


\section*{References}

\bibliography{My Article 02}


\end{document}
\endinput