9Barro, Robert J. and Sala-1-Martin, Xavier, 1991, "Convergence Across States and Regions," Brookings Papers on Economics Activity, No. 1,107-182. 被引量:1
10Barro, Robert J. and Sala-1-Martin, Xavier, 1992, "Convergence", Journal of Political Economy, 100:4, 223-251. 被引量:1