%\cite{van der Slot:FEL2015-TUP005}
\bibitem{van der Slot:FEL2015-TUP005}
    P.J.M.~van der Slot, K.-J.~Boller, and A.~Strooisma,
   \textquotedblleft{A Mirror-Less, Multi-Beam Photonic Free-Electron Laser Oscillator Pumped Far Beyond Threshold}\textquotedblright,
%  in \emph{Proc. FEL2015}, TUP005, pp. 334--337,
%  in \emph{Proc. FEL2015}, Daejeon, Republic of Korea, August 2015, paper TUP005, pp. 334--337,
   in \emph{Proc. 37th International Free Electron Laser Conference (FEL2015)}, Daejeon, Republic of Korea, August 2015, paper TUP005, pp. 334--337,
    ISBN: 978-3-95450-134-2,
    \url{http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/tup005.pdf},
    doi:10.18429/JACoW-FEL2015-TUP005, 2015.