1. P. Jeaglé, Coherent sources of XUV radiation: soft X-ray lasers and high-order harmonics generation, Springer Series in Optical Sciences (Springer, New York, 2005)
2. S. Watanabe, K. Midorikawa (ed.) Ultrafast Optics V, Springer Series in Optical Sciences, Springer, New York (2007)
3. Linac Coherent Light Source, Stanford Linear Accelerator Center,
http://www.ssrl.slac.stanford.edu/lcls/
4. The European X-Ray Laser Project XFEL,
http://xfel.desy.de/
5. RIKEN JASRI SPring-8 Joint Project for XFEL,
http://www.riken.jp/XFEL/eng/index.html