Determination of Zinc Levels in Tuna Circulating in Sei Sikambing Market by Visible Spectrophotometry. Jurnal Indah Sains dan Klinis, [S. l.], v. 1, n. 1, p. 18–21, 2020. DOI: 10.52622/jisk.v1i1.4. Disponível em: https://ejournal.sumateraconnect.or.id/index.php/jisk/article/view/4.. Acesso em: 19 sep. 2024.