1. E. Schrödinger:Ann. Phys. (Leipzig),80, 437 (1926).
2. A. Dalgarno: inQuantum Theory, Vol.1, edited byD. R. Bates (Academic Press, New York, N. Y., 1961).
3. J. Killinbeck:Rep. Prog. Phys.,40, 963 (1977).
4. P. M. Morse andH. Feshbach:Methods of Theoretical Physics (McGraw-Hill, New York, N. Y., 1953), Part. 2.
5. E. Durand:Mécanique quantique (Masson, Paris, 1970).