DUKA, B. A numerical experiment on the spherical harmonic analysis of core and crustal geomagnetic fields. Annals of Geophysics, [S. l.], v. 36, n. 5-6, 1993. DOI: 10.4401/ag-4246. Disponível em: https://www.annalsofgeophysics.eu/index.php/annals/article/view/4246. Acesso em: 17 jan. 2022.