Ulloa Ramos, Cristian Samir. “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, no. 20 (June 30, 2017): 11–23. Accessed October 5, 2026. https://mail.revistas.uclave.org/index.php/teacs/article/view/174.