1. G. Dimchev, An Experimental Study of the Working Load of Sintered Gears, Conference Proceedings, International Conference, New Materials and Technologies in the Powder Metallurgy, Sofia, 13–15 October 1990, p. 51
2. ISO 6336-3-96-Calculation of load capacity of spur and helical gears -- Part 3: Calculation of tooth bending strength
3. ISO 10825-97-Gear. Wear and damage to gear teeth
4. Maschinenelemente B III;Niemann,1983
5. Tough, Fatigue and Wear Resistant Sintered Gear Wheels, COPERNICUS Project CIPA CT 94-0108, Final Report, 01.07.1998