FERRO RAMOS, I. Synoptic global tendencies of solar background magnetic fields at the 19th cycle. Geofísica Internacional, [S. l.], v. 31, n. 2, p. 159–162, 1992. DOI: 10.22201/igeof.00167169p.1992.31.2.572. Disponível em: http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/1276. Acesso em: 23 jul. 2024.