1. Chestler R. B., Geusig J. E.:in Laser Handbook, (eds. F. T. Arecchi, E. Schulz-Dubois), North-Holland Publishing Co., Amsterdam, 1972, p. 325.
2. Kupeček Ph., Le Person H., Comte M.: Infrared Phys.19 (1979) 263.
3. Booklets of Quanta Ray Co., Mountain View, Calif. 1983 and booklets of JK Lasers Limited, Rugby, England 1984.
4. Ultrafast phenomena IV, (eds. D. H. Austin, K. B. Eisenthal), Springer-Verlag, Berlin-Heidelberg-New York-Tokyo, 1984.
5. Mareš J.: Research Report for Monokrystaly Turnov, Institute of Physics, Prague, 1981 (in Czech).