@article{villar_2016,  title={International cooperation on transboundary aquifers in South America and the Guarani Aquifer case},  volume={59},  ISSN={0034-7329},  url={https://doi.org/10.1590/0034-7329201600107},  DOI={10.1590/0034-7329201600107},  number={1},  journal={Revista Brasileira de Política Internacional},  publisher={Centro de Estudos Globais da Universidade de Brasília},  author={Villar, Pilar Carolina},  year={2016},  pages={e007} }