1. Klein, E., Fine, S., et al., First Ann. Conf. Biol. Effects of Laser Rad., Washington (April, 1964).
2. Staerk, H., and Czerlinski, G., Nature, 205, 63 (1965).
3. Hatchard, C. G., and Parker, C. A., Trans. Faraday Soc., 57, 1093 (1961).
4. Obata, H., Ogasaka, K., and Koisumi, M., Bull. Chem. Soc. Japan, 32, 125 (1959).
5. Porter, G., in Technique of Organic Chemistry, edit. by Weissberger, A., 8, 6A. II, 1090 (Interscience Publishers, New York and London, 1963).