1. Alban, L.E. (1985) Systematic Analysis of Gear Failures, American Society for Metals, Ohio.
2. Arora, S.R., and Lele, P.T. (1970) A note on optimal maintenance policy and sale date of a machine. Management Science, 17(3), 170–3.
3. Barlow, R.E., and Hunter, L.C. (1960) Optimal preventive maintenance policies. Operations Research, 8, 90–100.
4. Bergman, B. (1980) On the optimality of stationary replacement strategies. Journal of Applied Probability, 17, 178–86.
5. Bloch, H.P., and Geitner, F.K. (1983) Machinery Failure Analysis and Trouble-Shooting, Gulf Publishing Co.