“Adsorption of Mn(II) Ions from Wastewater Using Activated Carbon Obtained from Birbira (Militia Ferruginea) Leaves”. Global Journal of Science Frontier Research, vol. 12, no. B1, Jan. 2012, pp. 5-12, https://www.journalofscience.org/index.php/GJSFR/article/view/100147.