F?re R, S Grosskopf and F Hernandez-Sancho (2004). “Environmental Performance: An Index Number Approach.” Resource and Energy Economics 26(4): 343-352.

F?re R, S Grosskopf and F Hernandez-Sancho (2004). “Environmental Performance: An Index Number Approach.” Resource and Energy Economics 26(4): 343-352.

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