@book{
      international1971iaea,
      title={Commercial Portable Gauges for Radiometric Determination of the Density and Moisture Content of Building Materials},
      author={ },
      series={entity},
      number={130 },
      year={1971},
      isbn={92-0-165071-X },
      url={/publications/1231/commercial-portable-gauges-for-radiometric-determination-of-the-density-and-moisture-content-of-building-materials },
      publisher={INTERNATIONAL ATOMIC ENERGY AGENCY },
      address={Vienna}
    }