I. Ruiz, «About the theory and empirical analysis of “the persistence of profit”and its applicability to Colombia», ecos.econ., vol. 7, n.º 16, pp. 65–76, mar. 2003, Accedido: nov. 11, 2026. Disponible en: https://publicaciones.eafit.edu.co/index.php/ecos-economia/article/view/2000