1. Convergence across states and regions;Barro;BPEA,1991
2. Convergence;Barro;J. Polit. Econ.,1992
3. Capital mobility in neoclassical models of growth;Barro,1992
4. Productivity growth, convergence, and welfare: What the long-run data show;Baumol William;Amer. Econ. Rev.,1986