Garzon Gordon, A. J., and L. A. Hierro Recio. “External Effects of the War in Ukraine: The Impact on the Price of Oil in the Short-Term”. International Journal of Energy Economics and Policy, vol. 9, no. 2, Feb. 2019, pp. 267-76, https://www.econjournals.com/index.php/ijeep/article/view/7380.