“Use O-Phenylenediamine As an Oxidative Coupling Reagent in the Spectrophotometric Determination of an Antihistamine”. Samarra Journal of Pure and Applied Science 6, no. 4 (December 30, 2024): 69–79. Accessed May 3, 2026. https://www.sjpas.com/index.php/sjpas/article/view/777.