Dao, Hoang Thi, Ngo Thi Mai Hanh, and Cu Thi Lan. 2014. “An Analysis of Main Factors Impacting the Efficiency of Petrovietnam’s Refining and Petrochemical Projects”. Petrovietnam Journal 7 (July), 50-57. https://pvj.vn/index.php/TCDK/article/view/581.