F?re R, S Grosskopf and C Pasurka (1989). “Multilateral Productivity Comparisons When Some Outputs Are Undesirable: A Non-Parametric Approach.” Review of Economics and Statistics 71(1): 90-98.

F?re R, S Grosskopf and C Pasurka (1989). “Multilateral Productivity Comparisons When Some Outputs Are Undesirable: A Non-Parametric Approach.” Review of Economics and Statistics 71(1): 90-98.

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