@book{ international1966iaea, title={Radioisotope Instruments in Industry and Geophysics (Warsaw, 18-22 Oct. 1965)}, series={Proceedings Series}, year={1966}, isbn={92-0-060066-2}, url={http://www.dgdingfa.net/publications/2065/radioisotope-instruments-in-industry-and-geophysics-warsaw-18-22-oct-1965}, publisher={INTERNATIONAL ATOMIC ENERGY AGENCY}, address={Vienna} }
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