1. British Standards Institution BS EN 12504-4, Testing Concrete. Part 4. Determination of Ultrasonic Pulse Velocity, London, 2004.
2. National Earthquake Engineering Centre, DTR B BE 2-1: code of construction works for reinforced concrete structures, Algerian Technical Regulation Document (DTR), Algeria.
3. RILEM, Tests on the concrete by the method of the ultrasonic testing: recommendation of RILEM, Annals of the Technical Institute of the Building and Public Works, Series: Test and Measurements, No. 142, 1973.
4. M. Tchoketch Kebir, Non-destructive Testing Techniques for the Forensic Engineering Investigation of Reinforced Concrete Buildings, MSc dissertation, University of Teesside, 2005.