1. China Market Economy Research Center, Beijing Normal University, Beijing, P.R. China
2. School of Economics and Resource Management, Beijing Normal University, Beijing, P.R. China
3. Beijing Key Lab of Study on Sci-tech Strategy for Urban Green Development, Beijing Normal University, Beijing, P.R. China
4. School of Economics, Nankai University, Tianjin, P.R. China
5. The Center of Enterprise Green Governance, Chinese Academy of Environmental Planning, Beijing, P.R. China
6. Management Academy of China Cooperatives, Beijing, P.R. China