1. Arrow, K. J. (1962): “Economic Welfare and the Allocation of Resources for Invention”. InThe Rate and Direction of Inventive Activity: Economic and Social Factors, edited by R. R. Nelson. Princeton: Princeton University Press.
2. Bagwell, K., and Staiger, R. W. (1994): “The Sensitivity of Strategic and Corrective R&D Policy in Oligopolistic Industries”.Journal of International Economics 36: 133–150.
3. D'Aspremont, C., and Jacquemin, A. (1988): “Cooperative and Noncooperative R&D in Duopoly with Spillovers”.American Economic Review 78: 1133–1137.
4. — (1990): “Cooperative and Noncooperative R&D in Duopoly with Spillovers: Erratum”.American Economic Review 80: 641–642.
5. European Commission (1995): “Green Paper on Innovation”. European Commission, Brussels.