I. E. Onah, E. V. Moses, I. E. Ugwuoke, S. C. Eze, J. I. Okwor, and P. O. Ubachukwu, “Comparative ABO blood group and rhesus factor distribution between homogenous and heterogenous populations in South Eastern Nigeria”, Asian J Med Sci, vol. 10, no. 5, pp. 37–42, Aug. 2019.