1. H. Haken: Laser Theory, Encylopedia of Physics, Vol. XXV/2c (Springer, Berlin, Heidelberg, New York 1970)
2. F. T. Arecchi, E. O. Schulz-Dubois (eds.): Laser Handbook (North-Holland, Amsterdam 1972)
3. M. Sargent III, M. O. Scully, W. E. Lamb: Laser Physics (Addison-Wesley, Reading, MA 1974)
4. A. Yariv: Quantum Electronics (Wiley, New York 1967)
5. B. Saleh: Photoelectron Statistics, Springer Ser. Opt. Sci., Vol. 6 (Springer, Berlin, Heidelberg, New York 1978)