1. School of Economics and Management, Xinjiang University, Urumqi, P.R. China
2. Center for Innovation Management, Xinjiang University, Urumqi, P.R. China
3. School of Management and Economics, Beijing Institute of Technology, Beijing, P.R. China
4. Center for Energy and Environmental Policy Research, Beijing Institute of Technology, Beijing, P.R. China
5. School of Economics, Nankai University, Tianjin, P.R. China