RT Journal Article SR Electronic(1) A1 Cassidy, N.J. A1 Eddies, R. A1 Dods, S.YR 2012 T1 A Comparison Between GPR and Ultrasonic Techniques for VOID Detection Beneath Reinforced Concrete Sections JF , VO OP SP cp-329-00046 DO https://doi.org/10.3997/2214-4609-pdb.329.46 PB European Association of Geoscientists & Engineers, SN 2214-4609, AB , UL https://www.earthdoc.org/content/papers/10.3997/2214-4609-pdb.329.46