RAHARDJO, Monika; KARWUR, Ferry Fredy; RONDONUWU, Ferdy Semuel. Optical Properties and Relative Determination of Caffeine in Black Tea Liquor. Jurnal Sains Dasar, [S. l.], v. 8, n. 2, p. 45–49, 2019. DOI: 10.21831/jsd.v8i2.20781. Disponível em: https://journal.uny.ac.id/index.php/jsd/article/view/20781. Acesso em: 28 jun. 2025.