Banker RD, A Charnes, WW Cooper and AP Schinnar (1981). “A Bi-Extremal Principle for Frontier Estimation and Efficiency Evaluations.” Management Science 27(12): 1370-1382.

Banker RD, A Charnes, WW Cooper and AP Schinnar (1981). “A Bi-Extremal Principle for Frontier Estimation and Efficiency Evaluations.” Management Science 27(12): 1370-1382.

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