Dao Minh, P., N. Nghiem Thi, N. Nguyen Thi, and N. Pham Ba. “Global and Vietnam Olefin and Aromatic Market Trends under the Impact of Covid-19 Pandemic ”. Petrovietnam Journal, Vol. 7, Aug. 2021, pp. 31 -43, doi:10.47800/PVJ.2021.07-04.