1. Standard practice for measuring delaminations in concrete bridge decks by sounding,1987
2. Nondestructive evaluation: a tool in design, manufacturing, and service;Bray,1996
3. Detecting delaminations in concrete slabs with and without overlays using the impact-echo method;Sansalone;ACI Mater J,1989
4. Impact-echo: the complete story;Sansalone;ACI Struct J,1997
5. Inverse problems in fracture mechanics;Kubo,1994