Wei Q and G Yu (1997). “Analyzing Properties of K-Cones in the Generalized Data Envelopment Analysis Model.” J Econometrics 80(1): 63-84.

Wei Q and G Yu (1997). “Analyzing Properties of K-Cones in the Generalized Data Envelopment Analysis Model.” J Econometrics 80(1): 63-84.

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