4Stiglitz J E and Weiss A. Credit Rationing in Markets with ImpegCect Information [J]. The American Economic Review, Vol. 71 ,No. 3. Jun. 1981:393 -410.
5Mills E and Mackinnon J. Notes on the New Urban Econo- mics [R]. The Bell Journal of Economics And Management Science, Apr, 1973 : 593 - 601.
6Berger A. N. and Udell G. F. Small Business Credit Availa- bility And Relationship Lending: The Importance of Bank Or- ganizational Structure [J]. The Economic Journal, 2002, 112(20) : 32 -53.
7Gelos, R. Gaston & Werner, Alejandro M. Financial Liber- alization, Credit Constraints, And Collateral : Investment in the Mexican Manufacturing Sector [J]. Journal of Develop- ment Economics, Vol. 67, 2002 : 1 - 21.