O. C. O. C. Osifeko, O. L, B. K. Oguntade, L. F. Petrik, and A. D. Wusu, “REMOVAL OF CADMIUM (II), COBALT (II) AND NICKEL (II) IONS FROM AQUEOUS SOLUTION USING CORNCOB WASTE”, UJMST, vol. 5, no. 1, pp. 152-167, Jan. 2019.