R. Rafalowski, Z. Zegarska, A. Kuncewicz, and Z. Borejszo, “Fatty Acid Composition, Tocopherols and Beta-Carotene Content in Polish Commercial Vegetable Oils”, Pak. J. Nutr., vol. 7, no. 2, pp. 278–282, Feb. 2008, doi: 10.3923/pjn.2008.278.282.