Anderson Ngap Chai Kho, Yi Lung Then, Chee Khoon Ng, Dyg Norkhairunnisa Abang Zaidel, and Kok Yeow You. “Non-Destructive Evaluation of Concrete Strength Grades Using Dielectric Permittivity Measurements”. International Journal of Integrated Engineering 18, no. 1 (April 15, 2026): 170–185. Accessed July 23, 2026. https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/24385.