%\cite{Emma:FEL2015-WEP075}
\bibitem{Emma:FEL2015-WEP075}
    C.~Emma, Y.~Ding, Z.~Huang, A.A.~Lutman, G.~Marcus, A.~Marinelli, and C.~Pellegrini,
%   C. Emma \emph{et al.},
   \textquotedblleft{Femtosecond X-ray Pulse Generation with an Energy Chirped Electron Beam}\textquotedblright,
%  in \emph{Proc. FEL2015}, WEP075, pp. 722--725,
%  in \emph{Proc. FEL2015}, Daejeon, Republic of Korea, August 2015, paper WEP075, pp. 722--725,
   in \emph{Proc. 37th International Free Electron Laser Conference (FEL2015)}, Daejeon, Republic of Korea, August 2015, paper WEP075, pp. 722--725,
    ISBN: 978-3-95450-134-2,
    \url{http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/wep075.pdf},
    doi:10.18429/JACoW-FEL2015-WEP075, 2015.
