1. Abramowitz, M., and Stegun, J. A. (eds.) (1970). Handbook of Mathematical Functions. Dover, New York.
2. Beckman, P. (1967). Probability in Communication Engineering. New York.
3. On the number of intersections of a level by a Gaussian stochastic process, II;Belayev;Teor. Veroya t nost. i Primenen.,1967
4. Occupation times of stationary Gaussian processes;Berman;J. Appl. Probab.,1970