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R. Crookall, B. C. Khor,  Electro-Discharge Machined Surfgaces, Pro. 15th Int. Mach. Tool Des. Conf., pp.373-384 (1995). [g RÖŠ‡e] [5] L. C. Lee, Y. S. Wong,  Towards Crack Minimisation of EDMed Surfaces, J. Materials Processing Technology, 32, pp.513-523. (1990). 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