1. Gear tooth curvature treated simply;Wildhaber;American Machinist,1945
2. Basic geometry and tooth contact of hypoid gears;Baxter;Industrial Mathematic,1961
3. Methods of synthesis and analysis for hypoid gear-drives of “Formate” and “Helixform”, Parts 1, 2, and 3;Litvin;ASME Journal of Mechanical Design,1981
4. Local synthesis and tooth contact analysis of face-milled spiral bevel gears;Litvin,1991
5. Theory of gearing;Litvin,1989