1. ISO 3002/1 International Standard, “Geometry of the Active Part of Cutting Tools - Part I: General Terns, Reference Systems Working Angles”. First Edition 1977 - 06–15.
2. D.F. Galloway, “Some Experiments on the Influence of Various Factors on Drill Performance”. ASME Trans., Dec 9, 1955
3. E. Lens, S. Kaldor, “Drill Life Testing”, Part I. Discussion paper, CIRP, Jan., 1979 Paris, France.
4. E. Lenz, S. Kaldor, “Drill Life Testing”, Part II. Discussion paper, CIRP, August, 1979, Davos, Switzerland.