1. Thickness measurement of concrete elements using radar and ultrasonic impulse echo techniques;Krause,1995
2. Detecting delaminations in concrete slabs with and without overlays using the impact-echo method;Sansalone;ACI Materials Journal,1989
3. Novel ultrasound system to detect voids ducts in posttensioned bridges;Kroggel,1995
4. Inspection of concrete by ultrasonic pulse-echo-technique;Hillger,1994
5. Einfluβ der frequenzabhängigen Schallschwächung auf die Ultraschall-Laufzeitmessung an mineralischen Stoffen;Schickert,1994