4UN Water. Water, a shared responsibility: the United Nations world water development report 2JR]. UNESCO: World Water Assessment Programme, UN-WATER/WWAP/2006/3, 2006.
5Abudureyimu A, Han Q. Clean energy development of silk road economic belt in Xinjiang[J]. Applied Mechanics and Materials, 2014, 521:846-849.
6Maekerras C. Xinjiang in China's foreign relations: part of a new silk read or central Asian zone of conflict?[J]. East Asia, 2015, 32(1):25-42.
7Reinhard S, Knox L C A, Thijssen G J. Environmental efficiency with multiple environmentally detrimental variables; estimated with SFA and DEA[J]. European Journal of Operational Research, 2000, 121(2):287-303.
8Lin B, Long H. A stochastic frontier analysis of energy efficiency of China's chemical industry[J]. Journal of Cleaner Production, 2015, 87:235-244.
