1. Development of Gear Technology and Theory of Gearing;Litvin,1997
2. The Theory and Practice of Worm Gear Drives;Dudas,2000
3. Meshing Principle of Cylindrical Worm Drive;Wang,1979
4. Design and Application of the Worm Gear;Crosher,2002
5. A New Type of Cylindrical Worm Drive;Litvin,1965