Jamal Mohamad, Farah Aina, Anita Ahmad, Ruzairi Abdul Rahim, Sallehuddin Ibrahim, Juliza Jamaludin, and Noorhazirah Sunar. “The Identification of Optimal Frequency for Ultrasonic Transducers in Concrete-Defect Detection Using COMSOL® Simulator”. ELEKTRIKA- Journal of Electrical Engineering 24, no. 2 (August 29, 2025): 104–110. Accessed December 5, 2025. https://elektrika.utm.my/index.php/ELEKTRIKA_Journal/article/view/589.