A Simple Spectrophotometric Assay of Sildenafil In Pure and Pharmaceutical Preparations. Al-Nahrain Journal of Science, [S. l.], v. 15, n. 1, p. 18–24, 2018. Disponível em: https://anjs.edu.iq/index.php/anjs/article/view/1539.. Acesso em: 10 may. 2024.