1. Anufrieva, E. V., and Saitzeva, A. D., Izv. Akad. Nauk S.S.S.R., Ser. Fiz., 24, 755 (1960).
2. Smiril, V. L., and Hirshberger, A., Modern Plastics, 27, No. 11, 95 (1950).
3. Lewis, G. N., and Kasha, M., J. Amer. Chem. Soc., 66, 2100 (1944). McClure, D. S., J. Chem. Phys., 17, 905 (1945).
4. See, for example, Pringsheim, P., Fluorescence and Phosphorescence, Sec. VE (Interscience Pub., New York, 1949).
5. Kasha, M., J. Opt. Soc. Amer., 38, 1068 (1948). Germann, F. E. E., Lee, L. G., Brown, F. T., and Guthrie, L. M., J. Opt. Soc. Amer., 44, 496 (1954).