1. Ashcroft, N.W. & Mermin, N.D. (1976) “Solid State Physics”, Holt, Rinehart & Winston, N.Y.
2. Baer, T.M. (1986) Laser Focus 22, June 86, p. 82
3. Beigang, R., Litfin, G., Schneider, R. (1979) Phys. Rev. A 20, 229
4. Beyer, E., Märten, O., Behler, K., Weick, J.M. (1985) Laser und Optoelektronik 3, 282
5. Brown, D.C. (1981) “High-Peak-Power Nd:Glass Laser Systems” Springer Series in Optical Sciences, Vol. 25, Springer, Berlin