Mahmood AK. Spectrophotometric Determination of Ketotifen Drug in Pure form and Pharmaceutical Preparation Using Bromothymol Blue Via Ion-Pair Formation. Al-Nahrain J. Sci. [Internet]. 2013 Dec. 1 [cited 2026 May 22];16(4):1-10. Available from: https://anjs.edu.iq/index.php/anjs/article/view/513