Silviana, S., A. Darmawan, A. Subagyo, and F. Dalanta. “Statistical Approaching for Superhydrophobic Coating Preparation Using Silica Derived from Geothermal Solid Waste ”. ASEAN Journal of Chemical Engineering, Vol. 19, no. 2, Dec. 2019, pp. 91-99, https://dev.journal.ugm.ac.id/v3/AJChE/article/view/9085.