Oliynyk, O., Y. Taranenko, A. Shvachka, and O. Chorna. “Development of auto­oscillating System of Vibration Frequency Sensors With Mechanical Resonator”. Eastern-European Journal of Enterprise Technologies, vol. 1, no. 2 (85), Feb. 2017, pp. 56-60, doi:10.15587/1729-4061.2017.93335.