1. NP-084-15: Rules for testing base metal, welded joints, and built-up surfaces when operating equipment, pipelines, and other elements of nuclear power plants, Federal Environmental, Industrial, and Nuclear Supervision Service of Russia, Order #502 of December 7, 2015.
2. http://www.olympus-ims.com/en/books/. Cited October 24, 2016
3. Voronkov, V.A., Voronkov, I.V., Kozlov, V.N., Samokrutov, A.A., and Shevaldykin, V.G, On applicability of antenna-array techniques in solving the problems of ultrasonic testing of hazardous industrial objects, V Mire Nerazrushayushchego Kontrolya, 2011, no. 1 (51), pp. 64–70.
4. Bazulin, E.G, Comparison of systems for ultrasonic nondestructive testing using antenna arrays or phased antenna arrays, Russ. J. Nondestr. Test., 2013, vol. 49, no. 7, pp. 404–423.
5. Goryunov, A.A. and Saskovets, A.V., Obratnye zadachi rasseyaniya v akustike (Inverse Scattering Problems in Acoustics), Moscow: Moscow State Univ., 1989.