S.H. Kim, M.-H. Cho, K.Y. Jang, H.-S. Kang, D.S. Kim, G.H. Kim, \emph{et al.}, "PAL XFEL Pulse Modulator System Test Results Using a High Precision CCPS", in Proc. 37th International Free Electron Laser Conference, Daejeon, Republic of Korea, August 2015, paper MOP029, pp. 89-92, ISBN: 978-3-95450-134-2, doi:10.18429/JACoW-FEL2015-MOP029, http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/mop029.pdf, 2015.