Jurnal Ilmiah Sains, [S. l.], v. 12, n. 1, p. 1–7, 2012. DOI: 10.35799/jis.12.1.2012.394. Disponível em: https://ejournal.unsrat.ac.id/v3/index.php/JIS/article/view/394. Acesso em: 27 mei. 2024.