“Adsorption of Mn(II) ions from wastewater using activated carbon obtained from Birbira (Militia ferruginea) leaves” (2012) Global Journal of Science Frontier Research, 12(B1), pp. 5–12. Available at: https://journalofscience.org/index.php/GJSFR/article/view/100147 (Accessed: 20 February 2026).