1. The economic consequences of learning-by-doing;Arrow;Review of Economic Studies,1962
2. Intensity of competition and the choice between product and process innovation;Bonanno;International Journal of Industrial Organization,1998
3. Cooperative and noncooperative R&D in duopoly with spillovers;d'Aspremont;American Economic Review,1988
4. R&D networks;Goyal;RAND Journal of Economics,2001
5. Goyal, S., Konovalov, A., Moraga-González, J.L., 2003, Hybrid R&D, Tinbergen Institute discussion paper TI 2003-041/1.