VERNON, A.; CANDER, L. R. Regional GPS receiver networks for monitoring local mid-latitude total electron content. Annals of Geophysics, [S. l.], v. 45, n. 5, 2002. DOI: 10.4401/ag-3527. DisponĂ­vel em: https://www.annalsofgeophysics.eu/index.php/annals/article/view/3527. Acesso em: 17 jan. 2022.