1Berger, A., and G.Udell. 1995. Relationship lendingand lines of credit in small firm finance[J].Journal of Busi-nesses.
2Stiglitz,J, Weiss, A. 1981. Credit Rationing in Mar-kets with Imperfect Information[J] .American economic Re-view, (03).
3Bottazzi,L.and M. Da Rin. 2002. Venture capital inEurope and the financing of innovative companies [J]. Eco-nomic Policy, 17(34).
4Irwin,D. and J.M. Scott. 2010. Barriers faced bysmes in raising bank finance[J]. International Journal of En-trepreneurial Behaviour & Research, 16(3).
5Casamatta,C.,and C. Haritchabalet. 2011.Dealingwith venture capitalists : Shopping around or exclusive nego-tiation. Working Paper.
6Rajan,R. 1992. Insiders and Outsiders : The ChoiceBetween Relationship and Arm's Length Debt[J]. Journal ofFinance, (47).
7SaintPaul G. 1992. Technological Choice, FinancialMarkets and Economic Development[J] .European EconomicReview,(3).
8Hall,B.2002.,the financing of research and develop-ment [J]. Oxford Review of Economic Policy, (18).
9Arrow,K. J. 1962. The Economic Implications ofLearning by Doing[J].The Review of Economic Studies, 29,(3).
10F.Silva, C Carreira. 2012. Do financial constraintsthreat the innovation process? Evidence from Portuguesefirms. [J] .Economics of Innovation and New Technolo-gy-2012.