1. H. P. Yuen, Tech, Rept. 482, M.I.T. RLE (1971).
2. W. Louisell, Quantum Statistical Properties of Radiation, Wiley, (1973).
3. H. Takahashi, in Advances in Communication Systems, Vol. 1, A. Balakrishnan, Ed., Academic (1965).
4. H. P. Yuen, Phys. Rev. A13, 2226 (1976).
5. R. J. Glauber, in Laser Handbook, Vol. 1, E. J. Arecchi and E. O. Schulz-Bubois, Eds., ELsevier (1972).