OMOKHEYEKE, O, et al. “RADIONUCLIDES AND TRACE METAL POLLUTION IN SEDIMENTS FROM THE UPPER BONNY ESTUARY IN SOUTHERN, NIGERIA”. Nigerian Journal of Fisheries, vol. 15, no. 1, June 2018, pp. 1342-8, https://fisonjournal.org.ng/index.php/njf/article/view/178.