1. J. Favard, Course of Local Differential Geometry, Gauthier-Villars, Paris (in French, translated into Russian).
2. Differential Geometry;Stoker,1969
3. Theory of Gearing;Litvin,1968
4. Theory of Gearing;Litvin;NASA reference publication 1212,1989
5. Gear Geometry and Applied Theory;Litvin,1994