DE MICHELIS, P.; CONSOLINI, G. On polar daily geomagnetic variation. Annals of Geophysics, [S. l.], v. 58, n. 5, p. G0549, 2015. DOI: 10.4401/ag-6801. Disponível em: https://www.annalsofgeophysics.eu/index.php/annals/article/view/6801. Acesso em: 20 sep. 2021.