R. A. Lawal, Y. N. Lohdip, J. J. . Gongden, and J. R. . Gungshik, “BIOSORPTION OF Pb(II) AND Cu(II) IONS FROM AQUEOUS SOLUTION USING COFFEE SENNA (Senna occidentalis) LEAVES AS BIOMASS ”, JCSN, vol. 46, no. 3, Jul. 2021.