1. Arnon, D. I., Allen, M. B., and Whatley, F. R., Nature, 174, 394 (1954).
2. Frenkel, A. W., J. Amer. Chem. Soc., 76, 5568 (1954).
3. Arnon, D. I., Whatley, F. R., and Allen, M. B., Science, 127, 1026 (1958).
4. Vishniac, W., Horecker, B. L., and Ochoa, S., Adv. in Enzymol., 19, 1 (1957).
5. Rabinowitch, E. I., Photosynthesis, 2 (Interscience Inc., New York, 1956).