ROSE, J. A.; ALLAIN, D. J.; MITCHELL, C. N. Reduction in the ionospheric error for a single-frequency GPS timing solution using tomography. Annals of Geophysics, [S. l.], v. 52, n. 5, p. 469–486, 2009. DOI: 10.4401/ag-4604. Disponível em: https://www.annalsofgeophysics.eu/index.php/annals/article/view/4604. Acesso em: 26 oct. 2021.