Onjefu, S., N. Kafidi, C. Kamunda, P. Uloko, M. Hitila, E. Ejembi, and J. Kennedy. “Activity Concentrations of 226^Ra, 232^Th, and 40^K in Common Maize Meal Consumed in Namibia and Their Potential Radiation Hazards”. NIGERIAN ANNALS OF PURE AND APPLIED SCIENCES, vol. 4, no. 1, Aug. 2021, pp. 131-6, doi:10.46912/napas.231.