1. Hu Z M. Development of the net-shape forging technology of gears (in Chinese). J Plasticity Eng, 2002, 9(4): 79–83
2. Li H B, Lu M, Luo J T, et al. Crack’s mechanism of tooth surface and control method in spur gear precison forging (in Chinese). J Plasticity Eng, 2003, 10(1): 25–27
3. Song Y Q, Wang M H, Guan X F. Chinese Patent, 200410010699.6, 2005-01-05