H. Pratama, E. Nursanto, R. Ernawati, and M. Giatman, “Adsorption of Heavy Metals Fe and Mn in Acid Mine Drainage from Coal Mining Waste Using Calcium Oxide and Fly Ash”, INVOTEK: Jurnal Inovasi Vokasional dan Teknologi, vol. 22, no. 2, pp. 107-116, Sep. 2022.