[1] Southwestern Univ Finance & Econ, Team Integrated Energy & Environm Res Studies TIE, Chengdu 610074, Peoples R China
[2] Univ Surrey, Dept Econ, Surrey Energy Econ Ctr, Guildford GU2 5XH, Surrey, England
[3] Beijing Inst Technol, Sch Management & Econ, Beijing, Peoples R China