Application of ultrasonic packet pulses of raleigh waves for testing the hardness of surface-hardened metals - S. Y. Pliesnetsov; H. M. Suchkov; R. P. Myhushchenko; O. Y. Kropachek; Yu. O. Pliesnetsov; A. V. Donchenko (Technical diagnostics and non-destructive testing, 2023)