1. T. R. Shives and W.A. Willard, Mechanical Failure: Definition of the Problem, NBS, p. 23 (1974).
2. Symposium, Materials for the Mining Industry, Vail, Colorado, pp. 90,91 (July, 1974 ).
3. M.G. Fontana and N.D. Greene, Corrosion Engineering, McGraw-Hill, p. 72 (1967).
4. L.E. Alban, “Why Gears Fail”, Metals Progress, p. 95 (Nov., 1970).