1. Sansalone M, Carino NJ. Impact-echo: a method for flaw detection in concrete using transient stress waves. NBSIR 86-3452. Gaithersburg, MD: National Bureau of Standards, September 1986. p. 222.
2. Detecting honeycombing, the depth of surface-opening cracks, and ungrouted ducts using the impact-echo method;Sansalone;Concrete Int,1988
3. Detecting delaminations in reinforced concrete slabs with and without asphalt concrete overlays using the impact-echo method;Sansalone;Mater J Am Concrete Inst,1989
4. Flaw detection in concrete by frequency spectrum analysis of impact-echo waveforms;Carino,1986
5. Detecting honeycombing, the depth of surface-opening cracks, and ungrouted ducts using the impact-echo method;Sansalone;Concrete Int,1988