1. Shevaldykin, V.G., Kozlov, V.N., and Samokrutov, A.A., Inspection of concrete by ultrasonic pulse-echo tomograph with dry contact, in 7th Eur. Conf. Nondestr. Test., Copengagen, May 26–29, 1998.
2. Schickert, M., Towards SAFT-imaging in ultrasonic inspection of concrete, in Int. Symp. Nondestr. Test. Civ. Eng. (NDT-CE), September 26–28, 1995, pp. 411–418.
3. Kozlov, V.N., Samokrutov, A.A., and Shevaldykin, V.G., RF patent No. 2082163. Ultrasonic low-frequency transducer, Byull. Izobret., 1997, no. 17.
4. Kartashev, V.G. and Kachanov, V.K., Optimal isolation of signals against the background of structural noise in ultrasonic flaw detection, Defektoskopiya, 1992, no. 7, pp. 14–24.
5. Kachanov, V.K., Kartashev, V.G., Sokolov, I.V., and Turkin, M.V., Problems of extracting ultrasonic signals from structural noise during inspection of articles produced from materials with complex structures, Russ. J. Nondestr. Test., 2007, vol. 43, no. 9, pp. 619–630.