“Investigation of the Opportunity to Develop a Phase-Frequency Ultrasonic Measuring Converter for the Speed of Natural Gas Flow in Closed Small Diameter Pipeline”. Visnyk of Vinnytsia Politechnical Institute, no. 5, Oct. 2019, pp. 7-13, https://doi.org/10.31649/1997-9266-2019-146-5-7-13.