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