8Holmes T,Schmitz J.A gain from trade:From unproductive entrepreneurship[J].Journal of Monetary Economics,2001,47(2):417-446.
9Easterly W,Levine R.Africa's growth tragedy:a retrospective,1960-89[J].Policy Research Working Paper Series 1503,The World Bank,1995.
10Smarzynska B.Composition of foreign direct investment and protection of intellectual property rights in transition economics[J].CEPR Working Paper 2228,September,1999.