Darweesh, S. A., A. S. Hammodi, and R. M. Mahmmod. “A New Spectrophotometric Method For The Determination of La (III) With 3-Hydroxy -4-(2-HydroxyPhenyl Azo) Naphthalene -1- Sulfonic Acid”. Ibn AL-Haitham Journal For Pure and Applied Sciences 24, no. 1 (December 29, 2016). Accessed March 26, 2025. https://jih.uobaghdad.edu.iq/index.php/j/article/view/869.