References
- P. G. Hoel, S. C. Port, C. J. Stone, Introduction to Probability Theory, Houghton Mifflin Company, Massachusetts, 1971, pp. 145–147.
- D. G. Kelly, Introduction to Probability, Macmillan Publishing Company, New York, 1994, pp. 306–320.
- J. Pitman, Probability, Springer-Verlag, New York, 1993, pp. 373–377.