1. R.J. Glauber: Phys. Rev. 131 2766 (1963).
2. W.H. Louisell: Radiation and Noise in Quantum Electronics (McGraw Hill, New York 1964) Chapter VI, pp. 220–252.
3. R.G. Gallager: Information Theory and Reliable Communication (Wiley, New York 1965)
4. H. Takahashi: Advances in Communication Systems
1 (Academic Press 1966) 227–310.
5. J. Wozencraft, I. Jacobs: Principles of Communication Engineering (Wiley, New York 1968).