E. Hemsing,
   "Transforming the FEL: Coherence, Complex Structures, and Exotic Beams",
   in Proc. 37th International Free Electron Laser Conference, Daejeon, Republic of Korea, August 2015, paper MOB03, pp. 10-16,
    ISBN: 978-3-95450-134-2,
    doi:10.18429/JACoW-FEL2015-MOB03,
    http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/mob03.pdf, 2015.