Ismail, W.A. and Faizullah, A.T. (2013) “Detemination of Urea Using Fia-Cl System”, Science Journal of University of Zakho, 1(2), pp. 798–813. Available at: https://www.sjuoz.uoz.edu.krd/index.php/sjuoz/article/view/399 (Accessed: 20 December 2025).