Shakir , K., and D. 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, vol. 1, no. 4, Aug. 2025, doi:10.33899/jwups.v1i4.28985.