Multilateral Productivity Comparisons When Some Outputs are Undesirable: A Nonparametric Approach Rolf Faere, Shawna Grosskopf, C. A. K. Lovell and Carl Pasurka The Review of Economics and Statistics Vol. 71, No. 1 (Feb., 1989), pp. 90-98 (article consists of 9 pages) Published by: The MIT Press Stable URL:
http://www.jstor.org/stable/1928055