1. A. O. Vatulyan, Coefficient Inverse Problems on Mechanics (Fizmatlit, Moscow, 2019) [in Russian].
2. N. S. Bakhvalov and G. P. Panasenko, Homogenization: Averaging Processes in Periodic Media (Kluwer, Dordrecht, 1989).
3. E. Sanchez-Palencia, Non-Homogeneous Media and Vibration Theory (Springer Verlag, Berlin, 1980).
4. V. A. Yurko, Introduction to the Theory of Inverse Spectral Problems (Fizmatlit, Moscow, 2007) [in Russian].
5. G. M. L. Gladwell, Inverse Problems in Vibration, 2nd ed. (Kluwer, New York, 2005).