“Spectrophotometric Determination of Ketotifen Drug in Pure Form and Pharmaceutical Preparation Using Bromothymol Blue Via Ion-Pair Formation”. Al-Nahrain Journal of Science 16, no. 4 (December 1, 2013): 1–10. Accessed November 25, 2024. https://anjs.edu.iq/index.php/anjs/article/view/513.