1. S.L. Hu, S.S. Qiao, Const. Mach. 11, 16 (1999). (in Chinese)
2. Y. Koyama, Tunnelling underground space. Technol. 18, 145 (2003). (in Chinese)
3. A. Salemi, A. Abdollah-Zadeh, Mater. Charact. 59, 484 (2008)
4. A. Matsuzaki, T. Hoshino, H. Hagihara, Kawasaki. Steel Giho. 34, 104 (2002). (in Japanese)
5. G.W. Shen, K.Y. Chen, X.S. Xiang, H.G. Fu, Wind Power Bearing Steel, Chinese Patent, No. 201010549735, 2010. (in Chinese)