5Di Maggio,P.and W.Powell, 1983, "The Iron Cage Revisited:Institutional Isomorphism and Collective Ratio- nality in Organizational Fields" , American Sociological Review,48(2),pp.147-160.
6Gao Shixian,The Review And Evolution On En- ergy Strategies And Policies, China National Energy Strat- egy And Policy 2020,2002.
7Haijiang H.Wang,China's Oil Industry And Market, ELSEVIER, 1999.
8Jin Zhang, Catch-up and competitiveness in Chi- na:the case of large firms in the oil industry, London & New York : Routledge Curzon, 2004.
9Oliver.Williamson, 1973, "Markets and Hierarch- ies :Some Elementary considerations , "?The American Economic Review,vol.63, no.2,316-325.
10Perrow, C. 1967, "A Framework for the Compara- tive Analysis of Organizations", American Sociological Re- view, 32(2),pp.194-208.