1. V. A. Granovskiĭ and M. D. Kudryavtsev, Datchiki Sist., No. 7, 70 (2008).
2. M. G. Boguslavskiĭ, V. M. Éliashberg, E. E. Sharova, and L. I. Fedotova, Izmer. Tekh., No. 7, 9 (1972).
3. V. A. Granovskiĭ, M. D. Kudryavtsev, A. I. Ryskin, and A. S. Shcheulin, RF Patent No. 2006140710 (14 October 2006).
4. V. M. Orera and R. Alkala, Phys. Status Solidi A 38(2), 621 (1976).
5. V. M. Orera and R. Alkala, Phys. Status Solidi A 44(2), 717 (1977).