Котурбаш, Т. Т., and М. О. Карпаш. “THE PRACTICAL IMPLEMENTATION OF THE DEVELOPED METHOD OF CONTACTLESS ULTRASONIC WALL THICKNESS OF THE GAS IN THE PROCESS OF IN-LINE INSPECTION OF GAS PIPELINES”. Oil and Gas Power Engineering, no. 1(17), May 2012, pp. 83-91, https://nge.nung.edu.ua/index.php/nge/article/view/40.