1. Abreu, M., De Groot, H. L., & Florax, R. J. (2004). Space and growth: A survey of empirical evidence and methods. Région Et Développement, 21, 13–44.
2. Acs, Z. J., Anselin, L., & Varga, A. (2002). Patents and innovation counts as measures of regional production of new knowledge. Research Policy, 31(7), 1069–1085.
3. Acs, Z. J., & Audretsch, D. B. (1989). Patents as a measure of innovative activity. Kyklos, 42(2), 171–180.
4. Acs, Z. J., Audretsch, D. B., & Feldman, M. P. (1992). Real effects of academic research: Comment. The American Economic Review, 82(1), 363–367.
5. Acs, Z. J., Audretsch, D. B., & Feldman, M. P. (1994). R&D spillovers and recipient firm size. The Review of Economics and Statistics, 336–340.