%\cite{Felber:FEL2015-MOP040}
\bibitem{Felber:FEL2015-MOP040}
    M.~Felber, Ł.~Butkowski, M.K.~Czwalinna, M.~Fenner, C.~Gerth, M.~Heuer, \emph{et al.},
%   M. Felber \emph{et al.},
   \textquotedblleft{Implementation of MTCA.4-based Controls for the Pulsed Optical Synchronization Systems at DESY}\textquotedblright,
%  in \emph{Proc. FEL2015}, MOP040, pp. 115--117,
%  in \emph{Proc. FEL2015}, Daejeon, Republic of Korea, August 2015, paper MOP040, pp. 115--117,
   in \emph{Proc. 37th International Free Electron Laser Conference (FEL2015)}, Daejeon, Republic of Korea, August 2015, paper MOP040, pp. 115--117,
    ISBN: 978-3-95450-134-2,
    \url{http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/mop040.pdf},
    doi:10.18429/JACoW-FEL2015-MOP040, 2015.