Lawal, A.I., Olayanju, A., Salisu, A.A., Asaleye, A.J., Dahunsi, O., Dada, O., Omoju, O.E. and Popoola, O.R. 2019. Examining Rational Bubbles in Oil Prices: Evidence From Frequency Domain Estimates. International Journal of Energy Economics and Policy. 9, 2 (Feb. 2019), 166–173.