%\cite{Sydlo:FEL2015-WEP047} \bibitem{Sydlo:FEL2015-WEP047} C.~Sydlo, M.K.~Czwalinna, M.~Felber, C.~Gerth, S.~Jabłoński, J.M.~Müller, \emph{et al.}, % C. Sydlo \emph{et al.}, \textquotedblleft{Femtosecond Timing Distribution at the European XFEL}\textquotedblright, % in \emph{Proc. FEL2015}, WEP047, pp. 669--671, % in \emph{Proc. FEL2015}, Daejeon, Republic of Korea, August 2015, paper WEP047, pp. 669--671, in \emph{Proc. 37th International Free Electron Laser Conference (FEL2015)}, Daejeon, Republic of Korea, August 2015, paper WEP047, pp. 669--671, ISBN: 978-3-95450-134-2, \url{http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/wep047.pdf}, doi:10.18429/JACoW-FEL2015-WEP047, 2015.