RYAN, M. An investigation of inorganic nitrogen compounds in the groundwater in the Valley of México. Geofísica Internacional, [S. l.], v. 28, n. 2, p. 417–433, 1989. DOI: 10.22201/igeof.00167169p.1989.28.2.1037. Disponível em: http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/1263. Acesso em: 23 jul. 2024.