1. R. P. Feynman, R. B. Leighton, and M. Sands,The Feynman Lectures in Physics III (Addison Wesley, Reading, 1965), Chapters 9, 10, and 14.
2. C. Cohen-Tannoudji, B. Diu, and F. Laloe,Mécanique Quantique (Hermann, Paris, 1973), Chapter 4.
3. E. Merzbacher,Quantum Mechanics (Wiley, New York, 1970).
4. M. Jammer,The Conceptual Development of Quantum Mechanics (McGraw Hill, New York, 1966), p. 153.
5. A. Galindo and C. Sánchez del Río,Am. J. Phys. 29, 582 (1961).