%\cite{Li:FEL2015-WEP054}
\bibitem{Li:FEL2015-WEP054}
    Y.~LiJ.~Pflüger,
   \textquotedblleft{Control of Gap Dependent Phase Errors on the Undulator Segments for the European XFEL}\textquotedblright,
%  in \emph{Proc. FEL2015}, WEP054, pp. 685--689,
%  in \emph{Proc. FEL2015}, Daejeon, Republic of Korea, August 2015, paper WEP054, pp. 685--689,
   in \emph{Proc. 37th International Free Electron Laser Conference (FEL2015)}, Daejeon, Republic of Korea, August 2015, paper WEP054, pp. 685--689,
    ISBN: 978-3-95450-134-2,
    \url{http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/wep054.pdf},
    doi:10.18429/JACoW-FEL2015-WEP054, 2015.