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“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, vol. 20, no. 1, pp. 19–23, Jul. 2021, doi: 10.22487/gravitasi.v20i1.15519.