Araw E. Ahmed, and Khalida M. Omar. “Spectrophotometric Estimation of Sulfasalazine Via Oxidative Coupling Reaction Using 8-Amino -2-Naphthlene Sulfonic Acid and Potassium Periodate”. African Journal of Advanced Pure and Applied Sciences (AJAPAS), vol. 2, no. 3, July 2023, pp. 127-39, https://aaasjournals.com/index.php/ajapas/article/view/450.