Giuseppe Acciani Girolamo Fornarelli Antonio Giaquinto Domenico Maiullari Gioacchino Brunetti Non-Destructive Technique for Defect Localization in Concrete Structures Based on Ultrasonic Wave Propagation. 541-554 2008 ICCSA (2) http://dx.doi.org/10.1007/978-3-540-69848-7_44 conf/iccsa/2008-2 db/conf/iccsa/iccsa2008-2.html#AccianiFGMB08