“Spectrophotometric Determination of Vancomycin Hydrochloride (Batch and Flow-Injection) Using O-Nitroaniline As Diazotized Chromogenic Reagent”. Iraqi Journal of Science, vol. 56, no. 4B, Feb. 2023, pp. 3025-3, https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/9341.