عبد الرحمن جمال حسن و أ.م.د. عمر عبد الحي شيخ احمد, "Using 2,4- Dinitroaniline as a Reagent for the Spectrophotometric Determination of Vancomycin Hydrochloride by Diazotization Coupling Reaction", jhas, م 9, عدد 2, ص 451–470, 2024, doi: 10.58916/jhas.v9i2.274.