2Surender, K. , Shunsuke, M. Sulfur Dioxide Allowances: Trading and Technological Progress [ J ]. Ecological Economics,2010,69(3) :623-631.
3Gollop, F. M. , Roberts, M. J. Environmental Regulations and Productivity Growth : The Case of Fossil-Fueled ElectricPower Generation[ J]. Journal of Political Economy , 1983,91(4): 654-674.