Key points are not available for this paper at this time.
, Shawna Grosskopf, C. A. Knox Lovell, Suthathip Yaisawarng, Derivation of Shadow Prices for Undesirable Outputs: A Distance Function Approach, The Review of Economics and Statistics, Vol. 75, No. 2 (May, 1993), pp. 374-380
Färe et al. (Sat,) studied this question.