1. GOST (State Standard) 14782–86: Nondestructive Testing. Welds. Ultrasonic Methods, 1996.
2. RD ROSEK-001-96: Load-Lifting Machines. Metal Constructions. Ultrasonic Testing. General Notions, Moscow, 1996.
3. Ushakov, V.M., Concepts of “Measuring Device” and “Testing Device” in Ultrasonic Flaw Detection, Kontrol’. Diangost., 2003, no. 5, pp. 64–65.
4. RMS 29–99 GSI: Metrology. Basic Terms and Definitions, Minsk, 2000.
5. RD 34.17.302–97: Hot-Water Steam-Boilers. Steam and Hot Water Pipelines, Vessels. Welded Joints. Quality Testing. Ultrasonic Testing. Basic Terms, Moscow, 1997.