1. Acs, Z. J., & Audretsch, D. B. (1989). Births and firm size. Southern Economic Journal, 2, 467–475.
2. Acs, Z. J., & Audretsch, D. B. (1990). Innovation and small firms. Cambridge MA: MIT.
3. Acs, Z. J., Arenius, M., & Hay, M. (2004). Global Entrepreneurship Monitor: 2004 Executive Report. London: Babson College and London Business School.
4. Alañon, A., Arauzo, J. M. & Myro, R. (2005). Accessibility and Industrial Location. Some Evidence from Spain. In Proceedings of the International Workshop on Firm Demography and Industrial Location, Universitat Rovira I Virgili, Reus.
5. Aranguren, M. J. (1999). Determinants of economic units creation in the period 1985–93. The case of the manufacturing industry in CAPV. Small Business Economics, 12, 203–215.