%\cite{Pfingstner:FEL2015-TUP013}
\bibitem{Pfingstner:FEL2015-TUP013}
    J.~Pfingstner, E.~Adli, A.A.~Aksoy, D.~Angal-Kalinin, C.J.~Bocchetta, M.J.~Boland, \emph{et al.},
%   J. Pfingstner \emph{et al.},
   \textquotedblleft{The X-Band FEL Collaboration}\textquotedblright,
%  in \emph{Proc. FEL2015}, TUP013, pp. 368--374,
%  in \emph{Proc. FEL2015}, Daejeon, Republic of Korea, August 2015, paper TUP013, pp. 368--374,
   in \emph{Proc. 37th International Free Electron Laser Conference (FEL2015)}, Daejeon, Republic of Korea, August 2015, paper TUP013, pp. 368--374,
    ISBN: 978-3-95450-134-2,
    \url{http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/tup013.pdf},
    doi:10.18429/JACoW-FEL2015-TUP013, 2015.