@book{
      international2014iaea,
      title={Worldwide Open Proficiency Test for X Ray Fluorescence Laboratories PTXRFIAEA09: Determination of Major, Minor and Trace Elements in a River Clay},
      author={ },
      series={entity},
      number={36 },
      year={2014},
      isbn={ },
      url={/publications/10685/worldwide-open-proficiency-test-for-x-ray-fluorescence-laboratories-ptxrfiaea09-determination-of-major-minor-and-trace-elements-in-a-river-clay },
      publisher={INTERNATIONAL ATOMIC ENERGY AGENCY },
      address={Vienna}
    }