@book{ international2010iaea, title={Almera Proficiency Test: Determination of Naturally Occurring Radionuclides in Phosphogypsum and Water}, series={Analytical Quality in Nuclear Applications Series}, number={15}, year={2010}, url={http://www.dgdingfa.net/publications/8451/almera-proficiency-test-determination-of-naturally-occurring-radionuclides-in-phosphogypsum-and-water}, publisher={INTERNATIONAL ATOMIC ENERGY AGENCY}, address={Vienna} }