“AN INITIAL STUDY ON A NON-INVASIVE ULTRASONIC TOMOGRAPHY FOR GLASS FIBRE REINFORCED EPOXY (GFRE) COMPOSITES PIPE”. Jurnal Teknologi 77, no. 17 (November 24, 2015). Accessed July 7, 2024. https://journals.utm.my/jurnalteknologi/article/view/6462.