R. Ratnawati, M. Christwardana, S. Sudirma, and E. Enjarlis, “Zinc Removal from ZnO Industrial Wastewater by Hydroxide Precipitation and Coagulation Methods: The Role of pH and Coagulant Dose”, j.ris.technol.pencegah., vol. 11, no. 2, pp. 35–42, Nov. 2020.