Detection of Sizes and Locations Air Voids in Reinforced Concrete Slab using Ground Penetrating Radar and Impact-Echo Methods. Jurnal Teknologi (Sciences & Engineering), [S. l.], v. 74, n. 3, 2015. DOI: 10.11113/jt.v74.4553. Disponível em: https://journals.utm.my/jurnalteknologi/article/view/4553.. Acesso em: 10 apr. 2025.