Published
    1. Evaluating multigrade school reform in Latin America. Comparative Education, 2008.
    2. How effective are private schools in Latin America? Comparative Education Review (with Marie-Andrée Somers and J. Douglas Willms), 2004.
    3. Privatization through vouchers in developing countries: The cases of Chile and Colombia (with Martin Carnoy). In Privatizing education, ed. Henry M. Levin, 2001.
    4. The politics of rural school reform: Escuela Nueva in Colombia (with Luis Benveniste). Journal of Education Policy, 2001.
    5. Constraints to implementing educational innovations: The case of multigrade schools. International Review of Education (with Luis A. Benveniste), 2000.
    6. The effectiveness of multigrade schools in Colombia. International Journal of Educational Development, 1998. Translated as: La efectividad del programa Escuela Nueva en Colombia. Ensayos sobre Economía Cafetera.