Gaiola AJF (2002). “Efficiency Evaluation in the Urban Solid Waste Systems of Portugal Using Data Envelopment Analysis.” in Emrouznejad A, R Green and V Krivonozhko (eds.) Efficiency and Productivity Analysis in the 21st Century, International Research in Management Science.

Gaiola AJF (2002). “Efficiency Evaluation in the Urban Solid Waste Systems of Portugal Using Data Envelopment Analysis.” in Emrouznejad A, R Green and V Krivonozhko (eds.) Efficiency and Productivity Analysis in the 21st Century, International Research in Management Science.

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