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.