C. Saisa-ardS. Rimjaem,
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   in Proc. 37th International Free Electron Laser Conference, Daejeon, Republic of Korea, August 2015, paper TUP040, pp. 455-458,
    ISBN: 978-3-95450-134-2,
    doi:10.18429/JACoW-FEL2015-TUP040,
    http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/tup040.pdf, 2015.