@book{
  international1991iaea,
  title={Isotope Techniques in Water Resources Development 1991},
  series={Proceedings Series},
  year={1991},
  isbn={92-0-000192-0},
  url={https://www.iaea.org/publications/3746/isotope-techniques-in-water-resources-development-1991},
  publisher={INTERNATIONAL ATOMIC ENERGY AGENCY},
  address={Vienna}
}