Hernández-Gamarra, Katerin, et al. “A Test of the Market Efficiency of the Integrated Latin American Market (MILA) Index in Relation to Changes in the Price of Oil”. International Journal of Energy Economics and Policy, vol. 5, no. 2, Apr. 2015, pp. 534-9, https://econjournals.com.tr/index.php/ijeep/article/view/1149.