1. Effect of EDM on the surface properties of tool and die steel;Barash;Met. Eng. Quart.,1965
2. L.L. Centa, The effect of EDM on the thermal fatigue resistance of H-13 die steel, M.S. Thesis, CWRU, Cleveland, OH, 1989.
3. J.R. Crookall, B.C. Khor, Residual stresses and surface effects in EDM, in: Proceedings of the 13th Machine Tool Design and Research Conference, 1972, pp. 1–11.
4. Metallurgy of spark machined surface;Lloyd;J. Iron Steel Inst.,1965
5. L.E. Samuels, Surface Damage Produced by the Electric-spark Cutting Process, The Institute of Metals, 1963, p. 114.