Luan, Nguyen Thanh, Phan Thi Thu Lan, and Nguyen Thi Hau. “Derivative Tools and Possible Application to Vietnamese Companies Operating in the Oil and Gas Sector”. Petrovietnam Journal 30 (March 31, 2018): 38-49. Accessed April 18, 2026. http://www.pvj.com.vn/index.php/TCDK/article/view/60.