Nguyen H, Nguyen D, Nguyen T. Initial development of a linear regression model to determine the copper (ii) ion content via a photometric method. VNUHCM Journal of Science and Technology Development [Internet]. 30Jun.2024 [cited 13Jul.2025];27(2):3357-6. Available from: http://stdj.scienceandtechnology.com.vn/index.php/stdj/article/view/4139