8Hu J, Wang S. Total-factor Energy Efficiency of Regions in China. Energy Policy[J]. 2006,34(17).
9F~ire R, Grosskopf S, Lovell C A K, et al. Multilateral Productivity Comparisons When Some Outputs are Undesirable: A Nonparametric Approach[J]. The Review of Economies and Statistics, 1989,71(1).
10Hu J, Lee Y. Efficient Three Industrial Waste Abatement for Regions in China[J]. The International Journal of Sustainable Development and World Ecology, 2008,15(2).
