3J. E. Stiglits , Andrew, Weiss Credit Rationing in Markets with Imperfect Information[J] American Economic Review, Vol. 71,1981, P393-410.
4Allen. N. Berger , G. F. Udell Relationship lending and lines of Credit in Small Firm Finance [J] The Journal of Business , Vol. 68,No. 3 , 1995, P351 -381.
5G. A. Akerlof The Market for "Lomons" : Quality Uncertainty and the Market Mechanism [ J] Quarterly Journal of Economics , Vol.84, No. 3, 1970, P488-500.
