1. Acs, Z. (1984). The changing structure of the U.S. Economy: Lessons from the steel industry. New York: Praeger.
2. Acs, Z., & Audretsch, D. (1988). Innovation in large and small firms: An empirical analysis. American Economic Review, 78(4), 678–690.
3. Acs, Z., & Audretsch, D. (1990). Innovation and small firms. Cambridge, MA: MIT Press.
4. Aidis, R., Estrin, S., & Mickiewicz, T. (2008). Institutions and entrepreneurship development in Russia: A comparative perspective. Journal of Business Venturing, 23(6), 656–672.
5. Angelucci, M., Estrin, S., Konings, J., & Zolkiewski, Z. (2002). The effect of ownership and competitive pressure on firm performance in transition countries: Micro evidence from Bulgaria, Romania and Poland. William Davidson Institute, Working Paper 434.