1. Advances in phased array ultrasonic technology applications, Waltman, Olympus NDT, 2007. http://www.olympus-ims.com/en/books/ .
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4. ISONIC DFA flaw detector. http://www.sonotronndt.com/i2009.htm .
5. Bazulin, E.G., Golubev, A.S., and Kokolev, S.A., Application of an ultrasonic antenna array for registering echo signals by the double-scanning method for obtaining flaw images, Russ. J. Nondestr. Test., 2009, no. 2, pp. 86–97.