1. Acs ZJ, Audretsch DB, Braunerhjelm P, Carlson B (2004) The missing link the knowledge filter and entrepreneurship in endogenous growth. Working Paper 4783. Center for Economic Policy Research, London
2. Acs ZJ, Audretsch DB, Braunerhjelm P, Carlson B (2005) Growth and entrepreneurship: an empirical assessment. Working Paper 3205. Discussion Papers on Entrepreneurship, Growth and Public Policy. Max Plank Institute of Economics. Jena, Germany
3. Audretsch DB (2006) The entrepreneurial society. Oxford University Press, New York
4. Audretsch DB (2009) The entrepreneurial society. J Technol Transf 34 (3): 245–254
5. Audretsch DB, Bonte W, Keilbach M (2008) Entrepreneurship capital and its impact on knowledge diffusion and economic performance. J Bus Venturing 23 (6):687–698