1. Mandel, L., Wolf, E.: Rev. Modern Phys.37, 231 (1965); and enclosed references
2. Klauder, J.R., Sudarshan, E.C.G.: Fundamentals in Quantum Optics. New York: W. A. Benjamin Inc. 1968, chapters 1, 2 and 3 and enclosed references
3. Glauber, R.J.: In: Quantum Optics and Electronics, edited by C. de Witt, A. Blandin and C. Cohen-Tannoudji. New York: Gordon and Breach Science Publishers, Inc. 1964
4. Kelley, P.L., Kleiner, W.H.: Phys. Rev.136, A 316 (1964)
5. Mandel, L., Sudarshan, E.C.G., Wolf, E.: Proc. Phys. Soc. (London)84, 435 (1964)