O. E. Adejumo, E. A. Popoola, O. A. Bamiro, J. O. Daodu, and O. J. Olaitan, “Physicochemical Characteristics and HPLC Determination of Alpha-Tocopherol in Eighteen Edible Vegetable Oils Marketed in Nigeria”, Dhaka Univ. J. Pharm. Sci, vol. 20, no. 1, pp. 49–57, Jun. 2021.