References
- Sanders , J. B. , Roosendaal , H. E. and Vitalis , F. 1978 . Radiation Effects , 38 : 201
- Glauber , R. J. 1968 . Fundamental Problems in Statistical Mechanics II , Edited by: Cohen , E. G. D. 140 Amsterdam : North Holland .
- Arecchi , F. T. and Schulz-Dubois , E. O. , eds. 1972 . Laser Handbook , 1 Amsterdam : North Holland .