Nugrahaningtyas, K.D., D.M. Widjonarko, and I.Y. Indriasari. “Study of Quartz Activation, Effect of PH and Ion Fe2+ Concentration in Supporting Processes”. EKSAKTA: Journal of Sciences and Data Analysis 11, no. 2 (February 17, 2012). Accessed November 24, 2024. https://journal.uii.ac.id/Eksakta/article/view/2521.