The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
%\cite{yu:ipac2021-mopab040}
\bibitem{yu:ipac2021-mopab040}
L.H. Yu,
\textquotedblleft{Gain of Hard X-Ray Fel at 3 GeV and Required Parameters}\textquotedblright,
% --- abbreviated form (published paper) - JACoW template Feb 2018 ---
in \emph{Proc. IPAC'21}, Campinas, SP, Brazil, May 2021, pp. 178--181.
\url{doi:10.18429/JACoW-IPAC2021-MOPAB040}
% --- additional material -ISSN/ISBN--
% ISBN: 978-3-95450-214-1, ISSN: 2673-5490