J. Lee, B.H. Oh, and M. Yoon,
   "Generating a Single-Spike SASE Pulse in the Soft X-Ray Regime by Velocity Bunching",
   in Proc. 37th International Free Electron Laser Conference, Daejeon, Republic of Korea, August 2015, paper MOP081, pp. 233-236,
    ISBN: 978-3-95450-134-2,
    doi:10.18429/JACoW-FEL2015-MOP081,
    http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/mop081.pdf, 2015.