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