1Belderbos R,Carree M & Lokshin B. Cooperative R&Dand Firm Performance [J]. Research Policy,2004,33(10):1477-1492.
2Veugelers R & Cassiman B.R&D cooperation betweenfirms and universities. Some empirical evidence from Bel-gian manufacturing[J].International Journal of IndustrialOrganization,2005,23(5):355-379.
