@book{
  international1991iaea,
  title={Airborne Gamma Ray Spectrometer Surveying},
  series={Technical Reports Series},
  number={323},
  year={1991},
  isbn={92-0-125291-9},
  url={https://www.iaea.org/publications/1427/airborne-gamma-ray-spectrometer-surveying},
  publisher={INTERNATIONAL ATOMIC ENERGY AGENCY},
  address={Vienna}
}