Chad-Umoren, Yehuwdah E., and Margaret A. Briggs-Kamara. “Environmental Ionizing Radiation Distribution in Rivers State, Nigeria”. Journal of Environmental Engineering and Landscape Management 18, no. 2 (June 30, 2010): 154-161. Accessed November 23, 2024. https://transport.vgtu.lt/index.php/JEELM/article/view/6081.