PIGA, C. and VIVARELLI, M., 2003. Sample selection in estimating the determinants of cooperative R&D. Applied Economics Letters, 10, pp.243–246
This article treats the selectivity issue in the analysis of cooperative R&D and also presents some new results, e.g. that a firm’s organization, vertical relationships and innovation strategy are important drivers of a decision to engage in R&D both independently and with external partners.