1. F. W. Taylor, On the Art of Cutting Metals, 3rd ed., The American Society of Mechanical Engineers, New York, USA, 1906.
2. R. Woxén, Theory and an Equation for the Life of Lathe Tools, Handling 119, Ingenjörsvetenskapsakademin, Stockholm, Sweden, 1932 (In Swedish).
3. O. Svahn, Machining Properties and Wear of Milling Cutters, Teknologie Doktor Dissertation, Royal Instituete of Technology, Stockholm, 1948.
4. W. W. Gilbert, Machining – Theory and Practice, American Sociaty for Metals, Cleveland, Ohio, 1950, pp 465.
5. M. Kronenberg, Grundzuge der Zerspannungslehre, Springer Verlag, Berlin 1954.