N. Shigeoka, M. Kimura, S. Miura, and K. Okihira,
   "Production Status of Accelerator Components",
   in Proc. 37th International Free Electron Laser Conference, Daejeon, Republic of Korea, August 2015, paper WEP038, pp. 658-661,
    ISBN: 978-3-95450-134-2,
    doi:10.18429/JACoW-FEL2015-WEP038,
    http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/wep038.pdf, 2015.