1. Shcherbinskii, V.G. and Belyi, V.E., A new informative sign of the character of flaws during ultrasonic testing, Defektoskopiya, 1975, no. 3, pp. 27–36.
2. Whittaker, I.S. and Jessop, T.J., Ultrasonic detection and measurements of defects in stainless steel, Brit. J. NDT, 1981, vol. 23, no. 6, pp. 293–303.
3. Gurvich, A.K. and Kuz’mina, L.I., Scattering indicatrices as a source of additional information on detected flaws, Defektoskopiya, 1970, no. 6, pp. 47–56.
4. Vopilkin, A.Kh., Difraktsionnye metody v ul’trazvukovom nerazrushayushchem kontrole (Diffraction Methods in Ultrasonic Nondestructive Testing), Moscow: Izd. NTO Priborprom, 1989.
5. Perevalov, S.P., Studying geometric and acoustic characteristics of erosive reflectors, Defektoskopiya, 1994, no. 9, pp. 15–31.