@article{articlec14c9562,
title   = {Geochemical and stable isotopic evolution of the Guarani Aquifer System in the state of São Paulo, Brazil},
author = {Sracek, Ondra and Hirata, Ricardo},
year = {2002},
doi = {10.1007/s10040-002-0222-8},
journal   = {Hydrogeology Journal}
}