@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.dgdingfa.net/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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