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Xu J, Zervopoulos P, Qian Z, Cheng Gang. A universal solution for units-invariance in data envelopment analysis.

Xu J, Zervopoulos P, Qian Z, Cheng Gang. A universal solution for units-invariance in data envelopment analysis. Theoretical and Practical Research in Economic Fields, 2012, 3(2): 121-8.