; ; . Jurnal Ilmiah Sains, [S. l.], v. 12, n. 2, p. 93–99, 2012. DOI: 10.35799/jis.12.2.2012.561. Disponível em: https://ejournal.unsrat.ac.id/v3/index.php/JIS/article/view/561. Acesso em: 17 mei. 2024.