1. Impact-echo;Sansalone,1997
2. Impact-echo: the complete story;Sansalone;ACI Struct J,1997
3. Detecting voids in grouted tendon ducts of post tensioned concrete structures using the impact-echo method;Jaeger;ACI Struct J,1996
4. Stack imaging of spectral amplitudes based on impact-echo for flaw detection;Ohtsu;NDT&E Int,2002
5. Inversion of defects by linearized inverse scattering methods with measured waveforms;Nakahara,2000