@book{
      international2010iaea,
      title={Worldwide Open Proficiency Test: Determination of Naturally Occurring Radionuclides in Phosphogypsum and Water},
      author={ },
      series={entity},
      number={18 },
      year={2010},
      isbn={ },
      url={/publications/8480/worldwide-open-proficiency-test-determination-of-naturally-occurring-radionuclides-in-phosphogypsum-and-water },
      publisher={INTERNATIONAL ATOMIC ENERGY AGENCY },
      address={Vienna}
    }