1. Mádr, V., Knejzlík, M., Kopečný, J., Novotný, I. Physical measurements,
SNTL Prague, 1991
2. Pekárek, S., Murla, M.: Physics II, ČVUT Praha, 1993
3. Physical measurements, et al., Ostrava 1993
4. CSN 010115 terminology in metrology
5. Obraz, J.: Ultrasonic testing material. SNTL, Prague, 1989
6. Non-destructive testing of materials - Practical (PTS - Josef Solnař)