1. Bolotovskii IA, Bezroukov BE et al (1986) Reference book by geometric calculation of invlolute and worm gear drives. M Machinary
2. GOST 19274-73. Cylindrical involute gear drives with internal gearig. Calculation of geometric parameters. Rassion State Standard
3. GOST 16530-70, GOST 16532-70. Gear drives. Russian State Standard
4. Nenov P (2002) Parametric optimizing of cylindrical gear drives. Sofia, Tehnica (Bulgarian), p 152
5. Nenov P, Angelova E, Dobreva A, Dobrev V (2010) Machine elements with almanac. UR, Ruse (Bulgarian), p 311