Ismail, Wshyar A., and Azad T. Faizullah. “Detemination of Urea Using Fia-Cl System”. Science Journal of University of Zakho 1, no. 2 (September 30, 2013): 798–813. Accessed November 25, 2024. https://sjuoz.uoz.edu.krd/index.php/sjuoz/article/view/399.