Ngadiman, N.L.S. (2022) “Preliminary Study of pH Sensor for Engine Oil Deterioration Detection Using Anodized Ta2O5 Nanotubular”, International Journal of Integrated Engineering, 14(3), pp. 229–240. Available at: https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/10403 (Accessed: 9 April 2026).