“Univariate and Multivariate Optimization of Spectrophotometric Determination of Europium (III) in Pure Form and Synthetic Sample”. Ibn AL-Haitham Journal For Pure and Applied Sciences 27, no. 2 (April 16, 2017): 198–210. Accessed May 2, 2024. https://jih.uobaghdad.edu.iq/index.php/j/article/view/344.