F?re R and CAK Lovell (1988). “Aggregation and Efficiency.” in Eichhorn W (eds.) Measurement in Economics 20, Physics-Verlag: 639-647.

F?re R and CAK Lovell (1988). “Aggregation and Efficiency.” in Eichhorn W (eds.) Measurement in Economics 20, Physics-Verlag: 639-647.

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