B. N. Kumila, F. Adityaa, F. Destyofrini, F. N. I. Sari, D. A. Pancorowati, and H. H. Kusuma, “Altering Coconut Shell Biomass to High-Ordered Graphitic Carbon with Nickel Catalyzation”, J. Penelit. Fis. Apl., vol. 13, no. 2, pp. 119–131, Dec. 2023.