1. Fujimori, E., Bull. Chem. Soc. Japan., 28, 334 (1955).
2. Wald, G., and Brown, P. K., J. Gen. Physiol., 35, 797 (1952).
3. Jones, R. F. and Fujimori, E., Physiol. Plant., 14, 253 (1961).
4. Kasha, M., J. Chem. Phys., 20, 71, (1502).
5. Leonhardt, H., and Weller, A., Luminescence of Organic and Inorganic Materials, edit. by Kallman, H. P. and Spruch, G. M., 74 (John Wiley and Sons, Inc., 1962).