Ahn TS, A Charnes and WW Cooper (1988). “Efficiency Characterisations in Different DEA Models.” Socio-Econ Plan Sci 2: 253-257.

Ahn TS, A Charnes and WW Cooper (1988). “Efficiency Characterisations in Different DEA Models.” Socio-Econ Plan Sci 2: 253-257.

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