N. Baroiu, S. Berbinsci, V. Teodor, C. Fetecău, and N. Oancea, “Hyperboloidal sharpening method for multi-flute curved edges drills”, Annals of ”Dunarea de Jos” University of Galati, Fascicle V, Technologies in machine building, vol. 28, no. 2, pp. 117-124, Nov. 2010.