A. Susanto, Abdullah, Muthia Elma, and Meilana Dharma Putra, “Characteristics of Heterogeneous Catalysts Fly Ash Fraction of Light Shell and Fiber of Palm Oil Mill Solid Waste Grown on Peatlands”, J. Adv. Res. Appl. Sci. Eng. Tech., vol. 28, no. 3, pp. 85–104, Nov. 2022.