“Efek Variasi Konsentrasi Zat Aktivator H3PO4 Terhadap Morfologi Permukaan Dan Gugus Fungsi Karbon Aktif Cangkang Kemiri: (The Effect of H3PO4 Variation on Morphology and Function Group of Activated Carbon of Hazelnut Shell)”. Gravitasi 20, no. 1 (July 1, 2021): 19–23. Accessed October 7, 2026. https://bestjournal.untad.ac.id/index.php/GravitasiFisika/article/view/15519.