Khalil , E. ., and S. . Sultan. “Spectrophotometric Determination of Hiamin Hydrochloride in Pharmaceutical Preparations by Azo-Coupling Reactions With Sulphacetamide Sodium Reagent”. Journal of Wahj Al-Ulom for Pure Sciences, vol. 1, no. 2, July 2025, doi:10.33899/jwups.v1i2.21900.