1. SAE Handbook, Society of Automotive Engineers, p. 207, 1955.
2. Shot-Peening Applications, 4th ed., Metal Improvement Company, Addison, IL.
3. J. M. Lessels and R. F. Brodrick:Proc. Int. Conf. on Fatigue, pp. 617–27, Inst. Mech. Eng., London, 1956.
4. R. L. Mattson and W. S. Coleman, Jr.:SAE Trans., 1954, vol. 62, pp. 546–56.
5. T. C. Simmons:Western Metals, 1952, Jan., vol. 10.