[2] Y. Ochi, N. Hasegawa, T. Kawachi, K. Nagashima. Appl. Opt., 46, 1500(2007).
[6] Y. Kato. X-ray laser research: perspective and physics issues. Conference Series-Institute of Physics, 186, 3(2005).
[10] M. Nishikino, T. Kawachi. Nat. Photonics, 8, 352(2014).
[15]
[16] B. J. Demaske, V. V. Zhakhovsky, N. A. Inogamov, I. I. Oleynik. Phys. Rev. B, 82, 064113(2010).