E. I. Ugwuja, B. N. Ejikeme, N. C. Ugwu, N. C. Obeka, E. I. Akubugwo, and O. Obidoa, “Comparison of Plasma Copper, Iron and Zinc Levels in Hypertensive and Non-hypertensive Pregnant Women in Abakaliki, South Eastern Nigeria”, Pak. J. Nutr., vol. 9, no. 12, pp. 1136–1140, Nov. 2010, doi: 10.3923/pjn.2010.1136.1140.