%\cite{van der Slot:FEL2015-TUP004}
\bibitem{van der Slot:FEL2015-TUP004}
    P.J.M.~van der Slot, H.~Freund, and P.J.M.~van der Slot,
   \textquotedblleft{Three-dimensional, Time-dependent Simulation of Free-Electron Lasers}\textquotedblright,
%  in \emph{Proc. FEL2015}, TUP004, pp. 331--333,
%  in \emph{Proc. FEL2015}, Daejeon, Republic of Korea, August 2015, paper TUP004, pp. 331--333,
   in \emph{Proc. 37th International Free Electron Laser Conference (FEL2015)}, Daejeon, Republic of Korea, August 2015, paper TUP004, pp. 331--333,
    ISBN: 978-3-95450-134-2,
    \url{http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/tup004.pdf},
    doi:10.18429/JACoW-FEL2015-TUP004, 2015.