Spectrophotometric Determination of Ketotifen Drug in Pure form and Pharmaceutical Preparation Using Bromothymol Blue Via Ion-Pair Formation. Al-Nahrain Journal of Science, [S. l.], v. 16, n. 4, p. 1–10, 2013. Disponível em: https://anjs.edu.iq/index.php/anjs/article/view/513.. Acesso em: 4 may. 2024.