Okujagu, D. C., and C. J. Elewa-Ikpakwu. “Pollution Analysis of an Active River Bottom Sediment in Borokiri (Ikpukulu River), Niger Delta, Nigeria”. European Multidisciplinary Journal of Modern Science, vol. 26, no. 3, Mar. 2024, pp. 6-21, doi:10.51699/emjms.v26i3.4.