VELLANTE, M. Some theoretical aspects of the two-level magnetovariational method. Annals of Geophysics, [S. l.], v. 40, n. 6, 1997. DOI: 10.4401/ag-3838. Disponível em: https://www.annalsofgeophysics.eu/index.php/annals/article/view/3838. Acesso em: 25 apr. 2024.