; ; . Jurnal Ilmiah Sains, [S. l.], v. 15, n. 2, p. 88–93, 2015. DOI: 10.35799/jis.15.2.2015.9222. Disponível em: https://ejournal.unsrat.ac.id/v3/index.php/JIS/article/view/9222. Acesso em: 17 mei. 2024.