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2. A point source-point receiver pulse-echo technique for flaw detection in concrete;Carino;ACI J. Proc.,1986
3. Detecting honeycombing, the depth of surface-opening cracks, and ungrouted ducts using the impact echo method;Sansalone;Concrete International,1988
4. Finite element studies of the impact-echo response of plates containing thin layers and voids;Lin;J. Nondestructive Evaluation,1990