1. Beaven, G. H., E. R. Holiday, andE. A. Johnson: In The Nucleic Acids, Ed.Chargaff, E., andI. N. Davidson, Vol. I, p. 493. New York: Academic Press 1955.
2. Berthier, G.: (private communication).
3. Daudel, R., R. Lefebvre, andC. Moser: Quantum Chemistry. New York: Interscience Publ. Inc. 1959.
4. Douzou, P., J. C. Francqu, M. Hauss, andM. Ptak: J. Chim. physique58, 926 (1961).
5. Hinze, T., andJ. Jaff�: J. Am. chem. Soc.84, 540 (1962).