1. W. H. Louisell,Quantum Statistical Properties of Radiation(Wiley, New York, 1973), pp. 296–303.
2. Über die Streuung von Strahlung durch Atome
3. The quantum theory of dispersion
4. M. Born and K. Huang,Dynamical Theory of Crystal Lattices(Oxford U.P., London, 1954).
5. P. A. M. Dirac,The Principles of Quantum Mechanics(Clarendon, Oxford, 1947), 3rd ed., p. 167 ff.;