“Continuous Flow Injection Analysis for The Photometric Determination of Metformin Drug Via The Release of Copper(II) Ion from Charged Gel Bead Crystal”. Iraqi Journal of Science 54, no. 1 (December 30, 2023): 17–26. Accessed August 10, 2025. https://www.ijs.uobaghdad.edu.iq/index.php/eijs/article/view/12014.