NDT-Defect Detection on Concrete using Ultrasonic: A Review: Farah Aina Jamal Mohamad, Ruzairi Abdul Rahim, Nasarudin Ahmad, Juliza Jamaludin, Sallehuddin Ibrahim, Mohd Hafiz Fazalul Rahiman, Nur Arina Hazwani Samsun Zaini, Navintiran, Syarfa Najihah Raisin, Fatinah Mohd Rahalim. (2021). Journal of Tomography System and Sensor Application, 4(1), 1–7. Retrieved from https://tssa.my/index.php/jtssa/article/view/140