BARRIENTOS MARÍN, J. School cover policy and academic achievement: the case of Medellin’s concession program. Perfil de Coyuntura Económica, [S. l.], n. 14, p. 159–171, 2010. Disponível em: https://revistas.udea.edu.co/index.php/coyuntura/article/view/5269. Acesso em: 5 feb. 2025.