H. Kumagai, Y. Iimura, K. Kobayashi, and M. Obara, "Novel metal oxide multilayer reflectors for “water-window” wavelengths by atomic layer deposition,"
in Conference on Lasers and Electro-Optics, D. Killinger, G. Valley, C. Chang-Hasnain, and W. Knox, eds.,
Vol. 11 of OSA Technical Digest
(Optical Society of America, 1997), paper CWF44.