1. Test method for measuring the P-wave speed and the thickness of concrete plates using the impact echo method;ASTM C 1383-4,1998
2. Impact-echo thickness frequency profile for the detection of voids in tendon duct;Abraham;ACI Structural Journal,2002
3. Laser interferometer robot for the detection of voids in tendon ducts with the impact echo method;Abraham,2009
4. Two enhanced complementary impact echo approaches for the detection of voids in tendon ducts;Abraham,2002
5. Time frequency analysis of impact echo signals: numerical modeling and experimental validation;Abraham;ACI Materials Journal,2000