Cheng, Gang and Qian, Zhenhua and Zervopoulos, Panagiotis (2011): Overcoming the infeasibility of super-efficiency DEA model: a model with generalized orientation.
Xu, Jin and Zervopoulos, Panagiotis and Qian, Zhenhua and Cheng, Gang (2012): A universal solution for units-invariance in data envelopment analysis.
Cheng, Gang and Qian, Zhenhua (2011): An epsilon-based measure of efficiency in DEA - An alternative method for the affinity index.
Cheng, Gang and Zervopoulos, Panagiotis and Qian, Zhenhua (2011): A variant of radial measure capable of dealing with negative inputs and outputs in data envelopment analysis.
Cheng, Gang and Qian, Zhenhua (2011): DEA数据标准化方法及其在方向距离函数模型中的应用.
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