1. RD 32.144-2000: Acceptance Nondestructive Testing. Solid Wheels, Tires, and Axles of Rolling-Stock Wheel Pairs. Requirements Specifications, 2000.
2. STO RZhD 1.11.XXX-2005. Acceptance Nondestructive Testing. Axles of Rolling-Stock Wheel Pairs. Methodical Instruction on Nondestructive Testing (Project).
3. Ermolov, I.N. and Lange, Yu.V., Nerazrushayshchii kontrol’. Spravochnik v7-mi tomakh (Nondestructive Testing. Handbook in 7 Volumes.), Klyuev, V.V., Ed., vol. 3: Ultrasonic Testing, Moscow: Mashinostroenie, 2004.
4. Ermolov, I.N., Kontrol’ ul’trazvukom. Kratkii spravochnik (Testing by Ultrasound. Brief Handbook), Moscow: NPO TsNIIMASS, 1999.
5. Ermolov, I.N., Vopilkin, A.Kh., and Badalyan, V.G., Raschety v ul’trazvukovoi defektoskopii (kratkii spravochnik) (Calculations in Ultrasonic Flaw Detection. Brief Handbook), Moscow: EKhO+, 2000.