1. Coblentz, Stair, and Hogue, Proc. Natl. Acad. Sci. U.S. 17, 401 (1931).
2. W. V. Mayneard, Rept. Progr. in Phys. 14, 396 (1951). See also “Report of a discussion on radiation chemistry,” The Faraday Society (1952).
3. Los Alamos Scientific Laboratory The Effects of Atomic Weapons (Government Printing Office, Washington, D.C., 1950), Chaps. 8 and 11.
4. E.U. Condon, Am. J. Phys. 15, 365 (1947) reviews its development.
5. A. Einstein, Ann. Physik 17, 132 (1905).