The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
%\cite{Zhou:IPAC2016-MOPOW020}
\bibitem{Zhou:IPAC2016-MOPOW020}
G. Zhou, Y. Jiao, J. Wu, G. Xu, and T. Zhang,
\textquotedblleft{Power Improvement of Free-Electron Laser Using Transverse-Gradient Undulator with External Focusing}\textquotedblright,
% in \emph{Proc. IPAC2016}, pp. 760--762,
% in \emph{Proc. IPAC2016}, Busan, Korea, Mar. 2016, paper MOPOW020, pp. 760--762,
in \emph{Proc. 7th International Particle Accelerator Conference (IPAC'16)},
Busan, Korea, Mar. 2016, paper MOPOW020, pp. 760--762,
% ISBN: 978-3-95450-147-2,
\url{http://jacow.org/ipac2016/papers/mopow020.pdf},
\url{doi:10.18429/JACoW-IPAC2016-MOPOW020}, 2016.