1. Kaplan, N.M. and Samokrutov, A.A., http://www.expertnk.ru/akc/a1214.pdf.
2. Badalyan, V.G., Bazulin, E.G., Vopilkin, A.Kh., Kononov, D.A., Samarin, P.F., and Tikhonov, D.S., Ul’trazvukovaya defektometriya metallov s primeneniem golograficheskikh metodov (Ultrasonic Flaw Detection of Metals Using Holographic Methods), Moscow: OOO NPTs Ekho+, 2008.
3. Badalyan, V.G. and Vopilkin, A.Kh., http://www.armada-ndt.ru/articles/8371/.
4. Hammer, F., Pichler, M., Fenzl, H., and Gebhard, A., Around and Around: An Investigation of Signals for Acoustic Position Estimation of Moving Objects. Proc. 14th Mechatronics Forum Int. Conf., Mechatronics, 2014, http://www.florianhammer.com/publications/Hammer2014_mechatronics.pdf.
5. Chao, J., Udpa, L., and Udpa, S. S., Ultrasonic signal analysis using wavelets transform. Review of progress in quantitative nondestructive evaluation, Thompson, D.O. and Chimenti, D.P., Eds., New York, 1993, vol. 12, pp. 735–742.