saarango@unal.edu.co
Faculty of Mines.Universidad Nacional de Colombia. Medellín.
Colombia
yady.barrero@udea.edu.co
Department of Economics. Universidad de Antioquia. Medellín.
Colombia
fernando.carriazo@urosario.edu.co
Department of Political Science and International Relations. Universidad del Rosario. Bogotá D.C.
Colombia