1. Repairable Systems Reliability;Ascher,1984
2. Optimum preventive maintenance policy;Barlow;Operations Research,1960
3. Mathematical Theory of Reliability;Barlow,1965
4. Braun, W.J., Li, W., Zhao, Y.Q., 1999. Properties of the geometric and related processes, Naval Research Logistics, submitted
5. A note on the optimal replacement problem;Lam;Advances in Applied Probability,1988