Ikhuoria, Esther U, and F F Okieimen. 2001. “?SCAVENGING CADMIUM, COPPER, LEAD, NICKEL AND ZINC IONS FROM AQUEOUS SOLUTION BY MODIFIED CELLULOSIC SORBENT”. Biological Sciences - PJSIR 44 (6):321-24. https://v2.pjsir.org/index.php/biological-sciences/article/view/1962.