Barrientos Marín, J. (2010) «School cover policy and academic achievement: the case of Medellin’s concession program», Perfil de Coyuntura Económica, (14), pp. 159–171. Disponible en: https://revistas.udea.edu.co/index.php/coyuntura/article/view/5269 (Accedido: 16enero2022).