1. Redchikov, V.V., Ul’trazvukovoi fazovyi metod izmereniya vibro-peremeshchenii (Ultrasonic Phase Method of Vibration Displacement Measurement), Moscow: MDNTP im. F.E. Dzerzhinskogo, 1973, pp. 194–199.
2. USSR Inventor’s Certificate no. 823824.
3. USSR Inventor’s Certificate no. 1048330.
4. RF Patent 2472109.
5. RF Patent 2548615.