7N.Berger,Gregory F.Udell, "Relationship Lending and Lines of Credit in small Firm Finance",Journal of Business,Vol.68,no.3. (1995),PP.351-381.
8DeYoung, R., Hunter, W.C., Udell, G.F. ,The past, present, and probable future for community banks.[J]. Journal of Financial Services Research 2004(25 ) : 85-133.
9Avery, R., Samolyk, K. Bank consolidation and the provision of banking services :The case of small commercial loans[R].Federal Deposit Insurance Corporation Working Paper.2000.