DUKA, Bejo; DUKA, Eni; PEQINI, Klaudio. Recovering external contribution from the monthly mean series of a given geomagnetic observatory. Annals of Geophysics, [S. l.], v. 59, n. 3, p. G0321, 2016. DOI: 10.4401/ag-6971. Disponível em: https://www.annalsofgeophysics.eu/index.php/annals/article/view/6971. Acesso em: 16 may. 2026.