Moreira Calderón, Cynthia Mercedes, and Mónica Leoro Llerena. “Analysis of the Evolution of Exports from the Tuna Sector to the European Union and Their Impact on the Trade Balance of Ecuador, Period 2014 - 2018”. Teorías, Enfoques Y Aplicaciones en Las Ciencias Sociales, vol. 13, no. 27, Dec. 2020, pp. 26-37, https://mail.revistas.uclave.org/index.php/teacs/article/view/3046.