I use bibtex, and there is a sample of my code:
Code: Select all
\documentclass[a4paper,fleqn]{cas-dc}
\usepackage[numbers]{natbib}
\bibliographystyle{elsarticle-num}
\begin{document}
\section{Introduction}
Text text text \cite{Askari2015, Song2017705, EbrahimiKhabbazi201335}.
\bibliography{cas-refs}
\end{document}