Setyoningrum, T. M.; Nandari, W. W.; Murni, S. W.; Nur, M. M. A. Effect of Particle Sizes and Sodium Hydroxide Concentrations on Silica Extraction from Minerals Obtained in Kalirejo Village, Kokap, Kulonprogo, Yogyakarta. Eksergi 2021, 18, 29-31.