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2. American Standard, USAS, B94.11-1967
3. “Material Removal Processes-Twist Drills and Drilling”;Armarego,1997
4. The Machining of Metals;Armarego,1969
5. Armarego E.J.A., Kang Dechun, 7th Int. Manuf. Conf. In China (IMCC), Harbin, China, 1995