%\cite{Blau:FEL2015-WEP008}
\bibitem{Blau:FEL2015-WEP008}
    J.~Blau, K. R.~Cohn, and W.B.~Colson,
   \textquotedblleft{Four-Dimensional Models of FEL Amplifiers and Oscillators}\textquotedblright,
%  in \emph{Proc. FEL2015}, WEP008, pp. 607--614,
%  in \emph{Proc. FEL2015}, Daejeon, Republic of Korea, August 2015, paper WEP008, pp. 607--614,
   in \emph{Proc. 37th International Free Electron Laser Conference (FEL2015)}, Daejeon, Republic of Korea, August 2015, paper WEP008, pp. 607--614,
    ISBN: 978-3-95450-134-2,
    \url{http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/wep008.pdf},
    doi:10.18429/JACoW-FEL2015-WEP008, 2015.
