1. Dhere, C., and Castelli, V., C.R. Acad. Sci., Paris, 206, 2003 (1938).
2. Szent-Gyorgyi, A., Bioenergetics, 29 (Academic Press, Inc., New York, 1957).
3. Steele, Richard H., Biochemistry, 2, 529 (1963).
4. Shiga, T., and Piette, L. H., Photochem. Photobiol., 3, 213 (1964).
5. Ogryzlo, E. A., J. Chem. Educ., 42, 647 (1965).