8Angelini, P., Salvo, R. D, Ferri, G., 1998, "Availability and Cost for Small Businesses: Customer Relationship and Credit Cooperatives",Journal of Banking and Finance, 22, 925-954.
9Berger, A.N., Udell, G.F., 1995, "Relationship Lending and Lines of Credit in Small Firm Finance", Journal of Business, 68, 351-382.
101998,"The Economics of Small Business Finance: The Role of Private Equity and Debt Market in the Financial Growth Cycle", Journal of Banking and Finance, 22, 613-673.