Application of regularization dimension to gear damage assessment. 
Zhipeng Feng, Ming J. Zuo Fulei Chu
Mechanical Systems and Signal Processing, 2009
Gear Damage Assessment Based on Cyclic Spectral Analysis 
Zhipeng Feng, Zuo, M.J., Rujiang Hao, Fulei Chu, El Badaoui, M.
IEEE Transactions on Reliability, 60(1), p.21-32, March 2011
Diagnosis of pitting damage levels of planet gears based on ordinal ranking
Xiaomin Zhao Zuo, Ming J Zhiliang Liu
IEEE Conference on Prognostics and Health Management (PHM), 2011
