1. Nikravesh, S.M.Y. and Goudarzi, M., A review paper on looseness detection methods in bolted structures, Lat. Am. J. Solids Struct., 2017, vol. 14, no. 12, pp. 2153–2176.
2. Zaitsev, V. Y., Sutin, A., Belyaeva, I.Y., and Nazarov, V., Nonlinear interaction of acoustical waves due to cracks and its possible usage for cracks detection, Modal Anal., 1995, vol. 1, no. 3, pp. 335–344.
3. Zaitsev, V. Y., Sas, P., and Wevers, M., Nonlinear modulation methods of structural damage de-tection based on dissipative nonlinear effects, in Proc. Int. Semin. Modal Anal., KU Leuven, 2001, pp. 233–242.
4. Kazakov, V., A modulation crack-detection technique: I. Instrumental method of implementation, Russ. J. Nondestr. Test., 2006, vol. 42, no. 11, pp. 709–716.
5. Zaitsev, V. Y., Nazarov, V., Gusev, V., and Castagnede, B., Novel nonlinear-modulation acoustic technique for crack detection, NDT & E Int., 2006, vol. 39, no.3, pp. 184–194.