1. The Catalogue of Products of Open Society “Aurora”. Volgograd, 1990 (in Russian)
2. N.A. Shulga, A.M. Bolkisev,Fluctuations of Piezoelectric Bodies. AS USSR. Mechanics Institute(Naukova dumka, Kiev, 1990), p. 228 (in Russian)
3. G. Katts (ed.),Magnetic and Dielectric Devices(Energiya, Moscow, 1964), p. 416 (in Russian)
4. A.I. Trofimov,Piezoelectric Transducers Static Forces(Mashinostroenie, Moscow, 1979), p. 95 (in Russian)
5. P.E. Kandiba, P.G. Pozdnyakov,Quartz Resonators, Moscow (in Russian)