1. Work prior to 1950 is reviewed byE. I. Rabinowitch, Photosynthesis and Related Processes, Vol. II, Part I, p. 635, Intersc. Publ., New York, 1951.
2. G. R. Seely andR. G. Jensen, Spectrochimica Acta,21, 1837, 1965.
3. N. G. Bakhsiev, Opt. Spectr.,10, 379, 1961;12, 350, 473 and 557, 1962.
4. S. B. Broyde andS. S. Brody, J. Chem. Phys.,46, 3334, 1967.
5. H. H. Strain, M. R. Thomas andJ. J. Katz, Biochem. Biophys. Acta,75, 306, 1963.