Spectrophotometric Determination of Promethazine Hydrochloride in Pharmaceutical Formulation by Oxidative Coupling. Samarra Journal of Pure and Applied Science, [S. l.], v. 3, n. 4, p. 79–90, 2021. DOI: 10.54153/sjpas.2021.v3i4.318. Disponível em: https://www.sjpas.com/index.php/sjpas/article/view/318. Acesso em: 16 apr. 2026.