3United Nations Development Programm,UNDP,New York,2000,inferred from Philip Andrews-Speed et al.,The Strategic Implications of China's Energy Needs,Oxford University Press Inc.,New York,2002,p.13.
4Daniel Yergin,"Ensuring Energy Security",Foreign Affairs,Vol.85,No.2,March/April 2006,pp.70-71.
5Joseph S.Nye et al.,"A U.S.Strategy for Energy Security",in David.A.Deese and Joseph S.Nye,eds.,Energy and Security,Ballinger Publishing Company,Cambridge,1981,p.391.
6Philip Andrews-Speed et al.,The Strategic Implications of China's Energy Needs,p.13.
