1. Convergence Across States and Regions;R J Barro;Brookings Papers on Economic Activity,1991
2. Economic Growth;R J Barro;Monetary Policy in Central and Eastern Europe,1995
3. Trade Convergence Among Countries;Ben David;Journal of International Economics,1996
4. Pitfalls and Opportunities: What Macroeconomist Should Know About Unit Roots;J Y Campbell;NBER Macroeconomics Annual,1991