Shakir , Karam, and Dawood Mohammed. “Spectrophotometric Determination of Doxycycline Hydrochloride in Its Pure Form and Its Pharmaceutical Preparations Using Reagent 2,4,6 - Tribromo-Anline by the Azo Coupling Reaction”. Journal of Wahj Al-Ulom for Pure Sciences 1, no. 4 (August 11, 2025). Accessed September 9, 2025. https://edusj.uomosul.edu.iq/index.php/jwups/article/view/28985.