1. F.P. Schäfer (ed.): Dye Lasers, Topics Appl. Phys. Vol. 1, 3rd edn. (Springer, Berlin, Heidelberg 1990)
2. A.E. Siegman: Lasers (University Science Books, Mill Valley, CA 1986)
3. S.E. Neister: SPIE, 335, 36 (1982)
4. L.G. Nair: Prog. Quantum Electron. 7, 153 (1982)
5. Y.G. Basov: Instrum. Exp. Tech. 29, 1239 (1986)