1. A. Yariv: Introduction to Quantum Electronics, 2nd. ed. (Holt, Rinehart and Winston, New York 1976)
2. A. Yariv: Quantum Electronics, 3rd edn. (Wiley, New York 1989)
3. M. Sargent III, M.O. Scully, W.E. Lamb, Jr.: Laser Physics (Addison Wesley, London 1974)
4. O. Svelto: Principles of Lasers, 3rd edn. (Plenum, New York 1989)
5. A.E. Siegman: Lasers (University Science Books, Mill Valley, Calif. 1986)