1. M.L. Novikov, USSR Patent, No. 109750, 1956.
2. A new method for seeking the optimum gear tooth profiles-the theoretical basis of Wildhaber–Novikov gearing;Ye;Mechanism and Machine Theory,2002
3. Design of high contact ratio spur gears using quadratic parametric tooth profiles;Tsai;Mechanism and Machine Theory,1998
4. AGMA 2101-C95, Fundamental rating factors and calculation methods for involute spur and helical gear (Metric version), American Gear Manufacturers Association, 1995.
5. ISO 6336-3: calculation of the load capacity of spur and helical gears. Part 3: Calculation of tooth bending strength, ISO, 1996.