7Acs, Z. J. , D. B. Audretsch, Innovation and Small Firms [M]. Cambridge, MA: MIT Press. 1990.
8Audretsch, D. B. , M. Feldman. R&D Spillovers and the Geography of Innovation and Production[ J]. American Economic Review . 1996,86 ( 3 ) : 630 - 640.
9Audretsch, D. B. , P. Stephan. Company - scientist Locational Links: the Case of Biotechnology[J]. American Economic Review . 1996,86(3) :641 -652.
10Blanclaflower, D. G.. Self - employment in OECD countries [ J]. Labour Economics. 2000(7) :471 - 505.