Mirzoyan, V.Gh., et al. “BEHAVIOR OF DIELECTRIC PERMITTIVITY OF PIEZOMONOCRYSTALL NEAR THE RESONANT FREQUENCY”. Proceedings of the YSU A: Physical and Mathematical Sciences, vol. 48, no. 3 (235), Nov. 2014, pp. 62-65, doi:10.46991/PSYU:A/2014.48.3.062.