1. Barro,R.J.& Sala-i-Martin,X.(1991).Convergence across States and Regions.Brookings Papers on Economic Activity,1,107?182.
2. Barro,R.J.& Sala-i-Martin,X.(1995).Economic Growth.New York.
3. Baretti,C., Fenge,R., Huber,B., Leibfritz,W.& Steinherr,M.(2000).Chancen und Grenzen fo ¨deralen Wettbewerbs (Opportunities and Limits of Federal Competition )(Vol.1).Munich: IFO Beitra ¨ge zur Wirtschaftsforschung.
4. Baretti,C., Huber,B.& Lichtblau,K.(2002).A tax on tax revenues.The incentive e.ects of equalizing transfers:Evidence from Germany.International Tax and Public Finance 9, pp.631?649.
5. Bird,R.& Wallich,C.(1993).Fiscal decentralization and intergovernmental relations in transition economies.World Bank Policy Research Working Papers 1122,Washington, DC,March.