1. V.G. Stepanov, M.I. Klestov, Poverkhnostnoe uprochnenie korpusnykh konstruksi (Surface Hardening of Hull Structures), Sudostroenie, Leningrad, 1977, p. 253 (in Russian).
2. A.A. Matalin, Technologicheskie metody povishenia dolgovechnosty mashin (Technological Methods of Improving the Live of Machine Parts), Tekhnika, Kiev, 1971, p. 356 (in Russian).
3. O.V. Abramov, Ultrasound in Liquid and Solid Metals, CRC Press, Boca Raton, FL, 1994, p. 451.
4. D.H. Norrie, G. Vries, An Introduction to Finite Element Analysis, Academic Press, New York, 1988, p. 145.
5. A.V. Kulemin, Ul'trazvuk i diffusya v metallakh (Ultrasound and Diffusion in Metals), Metallurgia, Moscow, 1988, p. 123 (in Russian).