ISMAIL, W. A.; FAIZULLAH, A. T. Detemination of Urea Using Fia-Cl System. Science Journal of University of Zakho, [S. l.], v. 1, n. 2, p. 798–813, 2013. Disponível em: https://sjuoz.uoz.edu.krd/index.php/sjuoz/article/view/399. Acesso em: 29 mar. 2024.