1. Repairable Systems Reliability;Ascher,1984
2. Probability and Measures;Billingsley,1968
3. Cox, D.R., Lewis, P.A., 1966. The Statistical Analysis of Series of Events, Vol. 23. Methuen, London, pp. 5–28.
4. Feller, W., 1966. An Introduction to Probability Theory and its Applications. Vol. 2. Wiley, New York.
5. Stopped Random Walks: Limit Theorems and Applications;Gut,1988