1. Development of Gear Technology and Theory of Gearing;Litvin,1997
2. Design and Application of the Worm Gear;Crosher,2002
3. The Theory and Practice of Worm Gear Drives;Dudás,2000
4. Design of Worm and Spiral Gears;Buckingham,1960
5. Meshing of elements having helicoid surfaces (in Hungarian), candidate dissertation;Magyar,1960