References
- Barlow , R.E. and Proschan , F. 1975 . “ Statistical Theroy of Reliability and Life Testing ” . In Probability Models , New York : Holt-Rinehart and Winston .
- Kotz , S. and Johnson , N.L. 1983 . Encyclopcdia of Statistical Sciences , Edited by: Read , C.B. Vol. 3 , New York : John Wiley & Sons .