1. Albrecht J, Navarro L, Vroman S: The effects of labour market policies in an economy with an informal sector. Econ J 2009, 119: 1105–1129. 10.1111/j.1468-0297.2009.02268.x
2. Alonso-Ortiz J, Leal J: The Elasticity of Informality to Taxes and Transfers. Working Paper 13–08, Centro de Investigación Económica, ITAM, Mexico City, Mexico; 2013.
3. Antón A, Hernández F, Levy S: The End of Informality in Mexico? Fiscal Reform for Universal Social Insurance. Inter-American Development Bank, Washington, D. C.; 2012.
4. Auerbach A, Kotlikoff L: Dynamic Fiscal Policy. Cambridge University Press, Cambridge; 1987.
5. Barón G: Gasto nacional en salud de Colombia: composición y tendencias 2004–2011. 2012. Accessed June 4, 2013 at http://eventos.aviatur.com.co/congresosistemasdesalud/agend.html