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