GONZÁLEZ PARRA, G.; ARENAS, A. J. A mathematical model for social security systems with dynamical systems. Ingeniería y Ciencia, [S. l.], v. 10, n. 19, p. 33–53, 2014. DOI: 10.17230/ingciencia.10.19.2. Disponível em: https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/2034. Acesso em: 24 apr. 2024.