L.T. CampbellA.R. Maier,
   "Dispersion of Correlated Energy Spread Electron Beams in the Free Electron Laser",
   in Proc. 37th International Free Electron Laser Conference, Daejeon, Republic of Korea, August 2015, paper WEP073, pp. 718-721,
    ISBN: 978-3-95450-134-2,
    doi:10.18429/JACoW-FEL2015-WEP073,
    http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/wep073.pdf, 2015.