D. Edem, O. Eka, I. Umoh, A. Udoh, and E. Akpan, “Effect of Red Palm Oil and Refined Palm Olein on Nutrient Digestion in the Rat”, Pak. J. Nutr., vol. 2, no. 5, pp. 271–278, Aug. 2003, doi: 10.3923/pjn.2003.271.278.