Yousef F, Al-Abachi M. Normal and Reverse Flow Injection- Spectrophotometric Determination of Vancomycin Hydrochloride in Pharmaceutical Preparations Using 2, 4-Dinitrophenylhydrazine. Iraqi Journal of Science. 2023;55(2B):623-633. Accessed December 5, 2025. https://www.ijs.uobaghdad.edu.iq/index.php/eijs/article/view/11742