1. Ahmad E, Baer K (1997) Colombia. In: Ter-Minassian T (ed) Fiscal Federalism in the theory and practice. International Monetary Fund, Washington, District of Columbia
2. Alesina A, Carrasquilla A, Echavarría JJ (2000) Decentralization in Colombia. Working paper series 15. Fedesarrollo, Bogotá, Colombia
3. Amstrong H, Taylor J (2000) Regional economics and policy, 3rd edn. Blackwell, Oxford
4. Anselin L (1987) Spatial econometrics: methods and models. Kluwer, Dordrecht, The Netherlands
5. Anselin L, Jayet H, Le Gallo J (2004) Spatial econometrics and panel data models. In: Matyas L, Sevestre P (eds) The econometrics of panel data, 3rd edn, Kluwer, Dordrecht (in press)