Nguyen, N., N. Hoang, and V. Truong. “The Effects from the International Crude Oil Returns to Asian Frontier Oil and Gas Company Stock Returns”. Science & Technology Development Journal: Economics- Law & Management, Vol. 5, no. 2, May 2021, pp. 1535-48, doi:https://doi.org/10.32508/stdjelm.v5i2.749.