1. On the drilling of metals. 1. Basic mechanics of the process;Oxford;Trans. ASME,1955
2. Wear of twist drills;Söderberg,1978
3. Stahl-Eisen Prüfblatt 1615,1975
4. Study of grain size in hardened high speed steel;Graff;Met. Progr.,1938
5. Tool-life of P/M drills and taps;Henderer,1978