T.O. Raubenheimer,
   "LCLS-II: Status of the CW X-ray FEL Upgrade to the LCLS Facility",
   in Proc. 37th International Free Electron Laser Conference, Daejeon, Republic of Korea, August 2015, paper WEP014, pp. 618-624,
    ISBN: 978-3-95450-134-2,
    doi:10.18429/JACoW-FEL2015-WEP014,
    http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/wep014.pdf, 2015.