The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
%\cite{Li:FEL2017-WEP060}
\bibitem{Li:FEL2017-WEP060}
S. Li, R.N. Coffee, J. Cryan, G. Guo, K.H. Hegazy, Z. Huang, \emph{et al.},
% S. Li, R.N. Coffee, J. Cryan, G. Guo, K.H. Hegazy, Z. Huang, A. Marinelli, A. Natan, T. Osipov, and D. Ray,
% S. Li \emph{et al.},
\textquotedblleft{Characterizing Sub-Femtosecond X-ray Pulses from the Linac Coherent Light Source}\textquotedblright,
in \emph{Proc. FEL2017}, \url{https://doi.org/10.18429/JACoW-FEL2017-WEP060}, 2018.
% in \emph{Proc. FEL2017}, \url{https://doi.org/10.18429/JACoW-FEL2017-WEP060}, pp. 535--538.
% in \emph{Proc. FEL2017}, Santa Fe, NM, USA, Aug. 2017, paper WEP060, \url{https://doi.org/10.18429/JACoW-FEL2017-WEP060}
% in \emph{Proc. 38th Int. Free Electron Laser Conf. (FEL'17)},
% Santa Fe, NM, USA, Aug. 2017, paper WEP060, pp. 535--538,
% ISBN: 978-3-95450-179-3,
% \url{http://jacow.org/fel2017/papers/wep060.pdf},
% \url{https://doi.org/10.18429/JACoW-FEL2017-WEP060}, 2018.