W. A. Ismail and A. T. Faizullah, “Detemination of Urea Using Fia-Cl System”, SJUOZ, vol. 1, no. 2, pp. 798–813, Sep. 2013, Accessed: Dec. 20, 2025. [Online]. Available: https://www.sjuoz.uoz.edu.krd/index.php/sjuoz/article/view/399