TARIGAN, K.; SIHOMBING, J. .; BARUS, A. Evaluation the adsorption ability of carbon onion peel on Ca ions. Jurnal Rekayasa, Teknologi Proses dan Sains Kimia (REPROKIMIA), [S. l.], v. 2, n. 2, p. 61–70, 2023. Disponível em: https://akses.ptki.ac.id/jurnal/index.php/reprokimia/article/view/133. Acesso em: 19 mar. 2025.