Portela MCAS, E Thanassoulis and G Simpson (2004). “Negative Data in DEA: A Directional Distance Approach Applied to Bank Branches.” JORS 55(10): 1111-1121.

Portela MCAS, E Thanassoulis and G Simpson (2004). “Negative Data in DEA: A Directional Distance Approach Applied to Bank Branches.” JORS 55(10): 1111-1121.

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