1. X. Liu, C. Wang, T. Liu, et al., Acta Photonica Sinica, 38, 112–114 (2009).
2. Kumar Atul, Kumar Dheeraj, U. K. Singh, et al., Int. J. Control Autom., 3, 63–70 (2011).
3. H. Naruse, H. Uehara, T. Deguchi, et al., Meas. Sci. Technol., 18, No. 10, 3202–3210 (2007).
4. A. V. Yurchenko, A. D. Mekhtiev, Y. G. Neshina, et al., Russ. J. Nondestruct., 54, No. 7, 528–533 (2018).
5. N. I. Gorlov and V. I. Eirikh, in: Proc. Int. Conf. “Saginovskie Readings 4,” Karaganda (2012), pp. 68–70.