1. Coltman, J. W., and Marshall, F. H., Phys. Rev., 72, 528A (1947); Nucleonics, 1, No. 3, 58 (1947).
2. Broser, I., and Kallmann, H., Z. Naturforsch., 2a, 439 and 642 (1947). Kallmann, H., Natur and Technik (July 1947).
3. Bell, P. R., Phys. Rev., 73, 1405 (1948). Moon, R. J., Phys. Rev., 73, 1210 (1948). Wouters, L. F., Phys. Rev., 74, 489 (1948). Hofstadter, R., Phys. Rev., 75, 796 (1949). Milton, J. D. C., and Hofstadter, R., Bull. Amer. Phys. Soc., 24 (1), 16 (1949). Coltman, J. W., Proc. Inst. Rad. Eng., 6, 37 (1949). Robinson, L. B., and Arnold, J. R., Rev. Sci. Instr., 20, 549 (1949). Elmore, W. C., and Hofstadter, R., Phys. Rev., 75, 203 (1949). Schiller, E. J., et al., Phys. Rev., 75, 900 (1949). Koch, G. E., and Graves, J. D., Bull. Amer. Phys. Soc., 24 (6), 11 (1949). Harding, G. N., Flowers, B. H., and Eppstein, J. S., Nature, 163, 990 (1949).
4. Birmingham Conference on Nuclear Physics, September 1948. Kallmann, H., Phys. Rev., 75, 623 (1949).
5. See, however, report on recent phosphor research at the Cornell Symposium (1946) of American Physical Society, especially papers by Seitz, Garlick, Urbach, Leverenz, and Nagy.