Hashem, O. A. “Development of a Spectrophotometric Method Based on a Schiff Base for the Determination of Sulfasalazine in Bulk Drug Substance and Pharmaceutical Dosage Forms”. Central Asian Journal of Medical and Natural Science, vol. 7, no. 4, Aug. 2026, pp. 165-74, https://cajmns.casjournal.org/index.php/CAJMNS/article/view/3361.