A. Rodriguez-Fernandez, K. Finkelstein, B. Pedrini, and S. Reiche,
   "Measurement of Spatial Displacement of X-rays in Crystals for Self-Seeding Applications",
   in Proc. 37th International Free Electron Laser Conference, Daejeon, Republic of Korea, August 2015, paper TUP022, pp. 405-408,
    ISBN: 978-3-95450-134-2,
    doi:10.18429/JACoW-FEL2015-TUP022,
    http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/tup022.pdf, 2015.