SKEIVALAS, Jonas. Usage of double carrier phase differences for ionospheric influence elimination in coordinates determination. Geodesy and Cartography, [S. l.], v. 31, n. 3, p. 88–91, 2012. DOI: 10.3846/13921541.2005.9636671. Disponível em: https://journals.vilniustech.lt/index.php/GAC/article/view/10966. Acesso em: 9 may. 2025.