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Cheng G, Zervopoulos P, Qian Z. A variant of radial measure capable of dealing with negative inputs and outputs in data envelopment analysis.

Cheng G, Zervopoulos P, Qian Z. A variant of radial measure capable of dealing with negative inputs and outputs in data envelopment analysis. European Journal of Operational Research (2012)

http://dx.doi.org/10.1016/j.ejor.2012.09.031.