The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
%\cite{Wang:IPAC2017-WEPAB065} \bibitem{Wang:IPAC2017-WEPAB065} Z. Wang, C. Feng, and Z.T. Zhao, \textquotedblleft{Proposal for the Generation of Terawatt, Attosecond X-Ray Pulses in Free Electron Lasers}\textquotedblright, % in \emph{Proc. IPAC2017}, pp. 2723--2726, % in \emph{Proc. IPAC2017}, Copenhagen, Denmark, May 2017, paper WEPAB065, pp. 2723--2726, in \emph{Proc. 8th Int. Particle Accelerator Conf. (IPAC'17)}, Copenhagen, Denmark, May 2017, paper WEPAB065, pp. 2723--2726, % ISBN: 978-3-95450-182-3, \url{http://jacow.org/ipac2017/papers/wepab065.pdf}, \url{https://doi.org/10.18429/JACoW-IPAC2017-WEPAB065}, 2017.