Cheng, Gang and Qian, Zhenhua and Zervopoulos, Panagiotis (2011): Overcoming the infeasibility of super-efficiency DEA model: a model with generalized orientation.
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.
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