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.