1. Y.-S. Lee, Principles of Terahertz Science and Technology (Springer-Verlag, USA, 2009).
2. M. Van Exter, C. Fattinger, and D. Grischkowsky, Opt. Lett. 14, 1128 (1989).
3. V. I. Fedorov, D. S. Serdyukov, O. P. Cherkasova, et al., Optich. Zh. 84 (8), 9 (2017).
4. I. Ilina, D. S. Sitnikov, and M. B. Agranat, High Temperature 56 (5), 789 (2018).
5. V. I. Fedorov, A. S. Pogodin, T. D. Dubatolova, et al., Biophysics (Moscow) 46 (2), 293 (2001).