1[1]Baumol、 Panzar & willig, Contestable Market and the Theory of Industry Structure, Harcourt Brace Jovanovich, 1982
2[2]Panzar, "Technological determinants of firm and industry structure", Handbook of Industrial Organization, Volume I,Edited by R.schmalensee and R.D.Willig, Elsevier Science Publishers B.V., 1989.
3[3]Sharkey, The Theory of Natural Monopoly , Cambridge University Press, 1982
4[4]Baumol ,"On the proper cost tests for natural monopoly in a multiproduct industry", The American Economic Review ,Volume67, Issue5, Dec., 1997.
5[8]见 Sharkey, The Theory of Natural Monopoly, Cambridge University Press, 1982
6[9]见 Sharkey, The Theory of Natural Monopoly,Cambridge University Press,1982
