1. Ultrasonic inspection of railway traction and rolling stock axles;Farley;NDT International,1978
2. Kopec, B. Attenuation of ultrasound as a phenomenon depending on fatigue limit in the structure of railway axles In: Ultrasonics International 81–Conference Proceedings IPC Science and Technology Press, Guildford, UK (1981) 147–151
3. Kopec, B. Effect of the Widmannstätten structure on attenuation of ultrasound In: Ultrasonics International 85– Conference Proceedings Butterworth, Guildford UK (1985) 458–463