1. Urban systems and historical path dependence;Arthur,1988
2. Government spending in a simple model of endogenous growth;Barro;Journal of Political Economy,1990
3. Economic growth in a cross section of countries;Barro;Quarterly Journal of Economics,1991
4. Convergence across states and regions;Barro;Brookings Papers on Economic Activity,1992
5. Economic Growth;Barro,1995