Article Bo, Fang-zhen; Yi, De-gang (2011)
Evolution of Mathematical Symbols in Physics Works Translated during Late Qing-Dynasty. Nei Menggu Shifan Daxue Xuebao (Ziran Kexue Ban) (pp. 197-201). (/isis/citation/CBB001250692/) unapi

Article Yi, De-gang (2007)
Source on Traditional Bow and Arrow Making. Nei Menggu Shifan Daxue Xuebao (Ziran Kexue Ban) (pp. 766-770). (/isis/citation/CBB000760553/) unapi

Article Yin, Xiaodong; Yi, De-gang (2007)
Two Phases of the Introduction of Western Firearms in the Ming and Qing Dynasties. Nei Menggu Shifan Daxue Xuebao (Ziran Kexue Ban) (pp. 504-508). (/isis/citation/CBB000760540/) unapi

Article Yi, De-gang; Zhao, Xinli; Qi, Zhongying (2005)
A Further Inquiry into Mechanical Performance of Chinese Bow and Zheng Xuan's Law of Elasticity. Ziran Kexueshi Yanjiu (Studies in the History of Natural Sciences) (p. 249). (/isis/citation/CBB000630887/) unapi

Article Yi, De-gang (2004)
The Manufacture and Management of Bow and Arrow in the Qing Dynasty. Guangxi Minzu Xueyuan Xuebao (pp. 16-23). (/isis/citation/CBB000411126/) unapi

Article Yi, De-gang; Zhang, Bai-chun (2003)
An Investigation on the Crossbow-Making Method of the Yao Nationality in Bama County of Guangxi Zhuang Autonomous Region. Zhongguo Keji Shiliao (China Historical Materials of Science and Technology) (p. 80). (/isis/citation/CBB000340112/) unapi