F.-J. Decker, W.S. Colocho, Y. Ding, R.H. Iverson, H. Loos, J. Sheppard, \emph{et al.},
   "Photon Energies beyond the Selenium K-Edge at LCLS",
   in Proc. 37th International Free Electron Laser Conference, Daejeon, Republic of Korea, August 2015, paper WEP022, pp. 630-633,
    ISBN: 978-3-95450-134-2,
    doi:10.18429/JACoW-FEL2015-WEP022,
    http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/wep022.pdf, 2015.