VOIGT, H.-J.; HEINKELE, T.; WOLTER, R. Characterization of groundwater vulnerability to fulfill requirements of the water framework directive of the European Union. Geofísica Internacional, [S. l.], v. 43, n. 4, p. 567–574, 2004. DOI: 10.22201/igeof.00167169p.2004.43.4.793. Disponível em: http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/793. Acesso em: 7 may. 2024.