Ulloa Ramos, Cristian Samir. 2017. “The Trade Between the Countries of the Pacific Alliance. An Analysis from the Gravitational Model and the Bilateral Exchange”. Teorías, Enfoques Y Aplicaciones en Las Ciencias Sociales 9 (20): 11-23. https://mail.revistas.uclave.org/index.php/teacs/article/view/174.