VERBANAC, G.; KORTE, M.; MIOARA MANDEA, M. Four decades of European geomagnetic secular variation and acceleration. Annals of Geophysics, [S. l.], v. 52, n. 5, p. 487–503, 2009. DOI: 10.4401/ag-4605. Disponível em: https://www.annalsofgeophysics.eu/index.php/annals/article/view/4605. Acesso em: 28 mar. 2024.