M. Doloksaribu, B. Prihandoko, K. Triyana, and H. Harsojo, “Preparation and Characterization of Activated Carbon Based on Coconut Shell for Supercapacitor”, IJSBAR, vol. 35, no. 3, pp. 430–437, Sep. 2017, Accessed: Oct. 12, 2025. [Online]. Available: https://gssrr.org/JournalOfBasicAndApplied/article/view/8048