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