1. Is public expenditure productive?;Aschauer;Journal of Monetary Economics,1989
2. Government spending in a simple model of economic growth;Barro;Journal of Political Economy,1990
3. Economic growth and convergence across the United States;Barro;NBER working paper no. 3419,1990
4. Convergence;Barro;Journal of Political Economy,1992
5. Productivity growth, convergence and welfare;Baumol;American Economic Review,1986