SANTOS, Marcelo C.; VANÍCEK, Petr; LANGLEY, Richard B. Orbit Improvement and Generation of Ephemerides for the Global Positioning System Satellites: A Summary. Revista Brasileira de Cartografia, [S. l.], v. 46, p. 95–99, 2020. Disponível em: https://seer.ufu.br/index.php/revistabrasileiracartografia/article/view/52408. Acesso em: 6 dez. 2025.