@book{ international1967iaea, title={Isotopes in Hydrology (Vienna, 14-18 Nov. 1966)}, series={Proceedings Series}, year={1967}, isbn={92-0-040067-1}, url={https://www.iaea.org/publications/2098/isotopes-in-hydrology-vienna-14-18-nov-1966}, publisher={INTERNATIONAL ATOMIC ENERGY AGENCY}, address={Vienna} }