1. B. Saleh:Photoelectron Statistics (Springer, Berlin, 1978), Chapt. II.
2. M. Loève:Probability Theory (Van Nostrand, New York N.Y., 1963), Chapt. X.
3. E. Wolf:J. Opt. Soc. Am.,72, 343 (1982).
4. See, for example,R. Martínez-Herrero andP. M. Mejás:J. Opt. Soc. Am.,72, 765 (1982).
5. See, for example,H. Gamo:Matrix treatment of partial coherence, inProgress in Optics, Vol.3, edited byE. Wolf (North-Holland, Amsterdam, 1964);R. Martínez-Herrero:Nuovo Cimento B,54, 205 (1979).