T. Daood, Luma, لمى, Hanan H. Ahmed, حنان, Khalida M. Omar, and خالدة. “Spectrophotometric Determination of Yttrium With Pyrocatechol Violet Reagent – Application to Water”. Rafidain Journal of Science 21, no. 6 (June 24, 2025): 18–30. Accessed August 13, 2025. https://rjps.uomosul.edu.iq/index.php/rsci/article/view/13038.