References
- Feller , W. 1966 . An Introduction to Probability Theory and Its Applications, Vol 1., , 2nd ed. , New York : John Wiley .
- Freund , J. E. 1971 . Mathematical Statistics, , 2nd ed. , New York : Prentice-Hall .
- Springer , M. 1979 . The Algebra of Random Variables , New York : John Wiley .