“Unveiling ZrO2 Natural Zeolite Catalytic Performance on Hydrocracking Palm Oil Mill Effluent Residue”. Jurnal Pendidikan Kimia 15, no. 2 (August 27, 2023): 100–110. Accessed March 23, 2026. https://jurnal.unimed.ac.id/2012/index.php/jpk/article/view/43324.