“Electrochemical Detection of Melatonin Using Gd-Doped ZnO Nanoparticles Modified Carbon Paste Electrode: Original Scientific Paper”. Journal of Electrochemical Science and Engineering 16 (October 23, 2025). Accessed September 19, 2026. https://pub.iapchem.org/ojs/index.php/JESE/article/view/2914.