1. Bu Weiling. The development trend of foreign drill top drive drilling device [J]. Petroleum Machinery. 2009.
2. Wang Yongqin, Li An, Wu Yongting. TDS - 11SA top drive system fault tree analysis [J]. Oil field machinery, 2009.
3. Hou Jiangdong Yang Yang. TD500/1000 type top drive application in ocean drilling [J]. Oil field machinery, 2010.
4. Li Peng, Mou Xinming, Gao Ming. Top drive center pipe strength finite element analysis [J]. Oil field machinery, 2009.
5. Li Shizhong. Core drill some suggestion on improving [J]. Journal of exploration engineering, 2000 (5): 11-13.