1Stem, L. T. , Common, M.S. Is there an environ-mental kuznets curve for sulfur? [ J]. Journal of En- vironmental Economics and Management, 2001 (41) : 162 - 178.
2Dasgupta, S. , Laplante, B. , Wang, H. , et al. Con- fronting the environmental kuznets curve [ J ]. Journal of Economic Perspectives, 2002,16( 1 ) : 147 - 168.
