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2. Abraham O., Cottineau L.M., Valade M., Bedaoui S., Argoul P. (2009) Laser interferometer robot for the detection of voids in tendon ducts with the impact echo method, Int. Conf. NDT-CE 2009, Nantes, France.
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4. Abraham O., Popovics J. (2010) Non destructive evaluation of reinforced concrete. Chapter 21: impact echo, pp. 466-489, ed. Maierhofer C., Reinhardt H.W., Dobman G., Woodhead Publ. Ltd.
5. AFNOR (2001) NF A09-202 Non-destructive testing - General principles for radiographic examination of reinforced concrete and prestressing materials by X- and gamma.