1. Coehn, A., Ber. Deutsch. Chem. Gesellschaft, 43, 880 (1910).
2. Fujishima, A., Honda, K., and Kikuchi, S., J. Chem. Soc. Japan (Kogyo Kagaku Zasshi), 72, 108 (1969).
3. Fujishima, A., and Honda, K., J. Chem. Soc. Japan, 74, 355 (1971).
4. Fujishima, A., and Honda, K., J. Institute of Industrial Science, University of Tokyo (Seisan Kenkyu), 22, 478 (1970).
5. Fujishima, A., Sugiyama, E., and Honda, K., Bull. Chem. Soc. Japan, 44, 304 (1971).