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.