1. AGMA, Gear Handbook Volume 1, Gear Classification Materials and Measuring Methods for Unassembled Gears. AGMA 380.03, January 1971.
2. Arai, M., and Ishikawa, G., “On the Accuracy of Machine Tool Gears”, 1st and 2nd reports, Bulletin Tokyo Institute of Technology, Nos. 75 and 80, 1966.
3. On Dynamic Measuring Method of the Rotating Error of the Master Worm-Wheel;Maruyama,1968
4. I.I. Murashov, Zubchatye Mechanizmy i Ih Tochnost, Izdatelstvo “Machinostroenie”, Moskva, 1967 (In Russian).
5. B.M. Abramov, Kolebanija Prjamozubyh Zubchatyh Koljos, Izdatelstvo Harkovskogo Universiteta. (In Russian).