A. Potylitsyn, D.Yu. Sergeeva, M.N. Strikhanov, and A.A. Tishchenko,
   "Smith-Purcell Radiation from Microbunched Beams Modulated after Passing the Undulators in FELs",
   in Proc. 37th International Free Electron Laser Conference, Daejeon, Republic of Korea, August 2015, paper WEP087, pp. 752-756,
    ISBN: 978-3-95450-134-2,
    doi:10.18429/JACoW-FEL2015-WEP087,
    http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/wep087.pdf, 2015.