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.