Jurnal Ilmiah Sains, [S. l.], v. 12, n. 1, p. 13–20, 2012. DOI: 10.35799/jis.12.1.2012.396. Disponível em: https://ejournal.unsrat.ac.id/v3/index.php/JIS/article/view/396. Acesso em: 18 mei. 2024.