1. Convergence across states and regions;Barro;Brookings Papers on Economic Activity,1991
2. Regional evolutions;Blanchard;Brookings Papers on Economic Activity,1992
3. The equalization of returns and regional economic growth;Borts;American Economic Review,1960
4. Economic Growth in a Free Market;Borts,1964
5. Shifting regional fortunes: the wheel turns;Browne;New England Economic Review,1989