%\cite{Wang:FEL2015-TUP072}
\bibitem{Wang:FEL2015-TUP072}
    L.~Wang, A.~Brachmann, F.-J.~Decker, Z.~Li, T.O.~Raubenheimer, J.F.~Schmerge, and F.~Zhou,
%   L. Wang \emph{et al.},
   \textquotedblleft{Cathode Ion Bombardment in LCLS and LCLS-II RF Gun}\textquotedblright,
%  in \emph{Proc. FEL2015}, TUP072, pp. 534--539,
%  in \emph{Proc. FEL2015}, Daejeon, Republic of Korea, August 2015, paper TUP072, pp. 534--539,
   in \emph{Proc. 37th International Free Electron Laser Conference (FEL2015)}, Daejeon, Republic of Korea, August 2015, paper TUP072, pp. 534--539,
    ISBN: 978-3-95450-134-2,
    \url{http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/tup072.pdf},
    doi:10.18429/JACoW-FEL2015-TUP072, 2015.