James, M Okuo, and P O Okolo. “?VARIATION OF HEAVY METAL CONCENTRATIONS IN WATER AND FRESHWATER FISH IN NIGER DELTA WATERS - A CASE STUDY OF BENIN RIVER”. Biological Sciences - PJSIR 46, no. 6 (December 22, 2003): 439–442. Accessed May 18, 2024. https://v2.pjsir.org/index.php/biological-sciences/article/view/1697.