T. DAOOD, L.; H. AHMED, H.; M. OMAR, K. Spectrophotometric Determination of Yttrium with Pyrocatechol Violet Reagent – Application to Water. Rafidain Journal of Science, [S. l.], v. 21, n. 6, p. 18–30, 2010. DOI: 10.33899/rjs.2010.6938. Disponível em: https://jwups.uomosul.edu.iq/index.php/rsci/article/view/47710. Acesso em: 29 sep. 2025.