Ahn TS, A Charnes and WW Cooper (1989). “A Note on the Efficiency Characterizations Obtained in Different DEA Models.” Socio-Econ Plan Sci 22(6): 253-257.

Ahn TS, A Charnes and WW Cooper (1989). “A Note on the Efficiency Characterizations Obtained in Different DEA Models.” Socio-Econ Plan Sci 22(6): 253-257.

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