SALH, D. M. Spectrophotometric Determination of Isoptin (Verapamil Hydrochloride) in Pharmaceutical Preparations. Ibn AL-Haitham Journal For Pure and Applied Sciences, Baghdad, Iraq., v. 23, n. 3, p. 106–115, 2017. Disponível em: https://jih.uobaghdad.edu.iq/index.php/j/article/view/913. Acesso em: 26 mar. 2025.