Bondarenko , O.G. 2019. DETERMINATION OF THE ACTUAL AREA OF DRY ACOUSTIC CONTACT IN THE SYSTEM “TRANSDUCER–PRODUCT” IN LOW-FREQUENCY DEFECTOSCOPY. METHODS AND DEVICES OF QUALITY CONTROL. 2(43) (Dec. 2019), 5–15. DOI:https://doi.org/10.31471/1993-9981-2019-2(43)-5-15.