1. Thyagarajan, K., Ghatak, A.K.: Lasers, Theory and Applications. Plenum Press, New York (1981)
2. Loudon, R.: The Quantum Theory of Light. Clarendon Press, Oxford (1983)
3. Meystre, P., Sargent, M., III: Elements of Quantum Optics. Springer, Berlin (1990)
4. Stenholm, S.: Lasers in Applied and Fundamental Research. Adam Hilger Ltd., Bristol (1985)
5. See also: Stenholm, S.: Foundations of Laser Spectroscopy. Wiley, New York (1983)