F?re R, S Grosskopf, CAK Lovell and C Pasurka (1989). “Multilateral Productivity Comparisons When Some Outputs Undesirable – a Nonparametric Approach.” Review of Economics and Statistics 7: 90-98.

F?re R, S Grosskopf, CAK Lovell and C Pasurka (1989). “Multilateral Productivity Comparisons When Some Outputs Undesirable – a Nonparametric Approach.” Review of Economics and Statistics 7: 90-98.

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