Oladoja, N. A., A. Ofomaja, and E. Ebare. “Evaluation of Sorption Capacity of Scrap Tyre in the Removal of Copper (II) Ion from Aqua System”. Biological Sciences - PJSIR, vol. 49, no. 6, Dec. 2006, pp. 400-6, https://v2.pjsir.org/index.php/biological-sciences/article/view/1266.