1. Antipov, V.S., Vasil’ev, V.D., Spirkov, A.B., and Udralov, Yu.I., Geometric parameters of Radiographic Testing of Joint Welds, V Mire Nerazrush. Kontrolya, 2005, no. 1(23), pp. 54–56.
2. GOST (State Standard) 7512-82: Nondestructive Testing. Welds. Radiographic Method, 1982.
3. EN 1435-94: Non-Destructive Examination of Welds. Radiographic Examination of Welded Joints, 1994.