各位仁兄：小弟写论文遇到两篇参考文献找不到，烦请各位仁兄伸出援助之手，在此先谢过。
第一篇：
Estimation of the shadow prices of pollutants with production/environment inefficiency taken into account: a nonparametric directional distance function approach Journal of Environmental Management, Volume 64, Issue 4, April 2002, Pages 365-375
Jeong-Dong Lee, Jong-Bok Park, Tai-Yoo Kim
第二篇：
Fare, R., Grosskopf, S., Lovell, C. A. K., & Yaisawarng, S. (1993). Derivation of shadow prices for undesirable outputs: A distance function approach. The Review of
Economics and Statistics, 75, 374–380.
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