6Baumol,W.J..On the proper Cost Test for Natural Monopoly in aMuhi-production Industry [J].American Economic Review,December 1977.
7Sharkey, W.W., The Theory of Nature Monopoly [ M ] Cambridge University Press, 1982.
8Kenneth Clarkson,Roger Leroy Miller. Industrial Organization:Theory,Evidence,and Public Policy [M].McGraw-Hill Book Company, 1982.
9Liu Dehai.Efficiency Analysis for Two Phase Combination Tender Model [C].Proceedings of 2006 International Conferrence on Con-straction and Real Estate Management, 2006,1 : 174-180.
10'The American Clean Energy and Security Act(Waxman-Markey Bill )”. http:// www.pewclimate.org/acesa .
