Z.G. He, Q.K. Jia, L. Wang, W. Xu, and S.C. Zhang,
   "Linac Design of the IR-FEL Project in CHINA",
   in Proc. 37th International Free Electron Laser Conference, Daejeon, Republic of Korea, August 2015, paper MOP010, pp. 46-48,
    ISBN: 978-3-95450-134-2,
    doi:10.18429/JACoW-FEL2015-MOP010,
    http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/mop010.pdf, 2015.