%\cite{Di Mitri:FEL2015-MOC03}
\bibitem{Di Mitri:FEL2015-MOC03}
    S.~Di MitriS.~Spampinati,
   \textquotedblleft{Estimate of Free-Electron Laser Gain Length in the Presence of Electron Beam Collective Effects}\textquotedblright,
%  in \emph{Proc. FEL2015}, MOC03, pp. 24--28,
%  in \emph{Proc. FEL2015}, Daejeon, Republic of Korea, August 2015, paper MOC03, pp. 24--28,
   in \emph{Proc. 37th International Free Electron Laser Conference (FEL2015)}, Daejeon, Republic of Korea, August 2015, paper MOC03, pp. 24--28,
    ISBN: 978-3-95450-134-2,
    \url{http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/moc03.pdf},
    doi:10.18429/JACoW-FEL2015-MOC03, 2015.