IBRAHIM YAHAYA, Salissou; EL AZZAB, Driss. Assessment of recent GOCE-based global geopotential models and EGM2008 in Niger Republic. Geodesy and Cartography, [S. l.], v. 45, n. 3, p. 116–125, 2019. DOI: 10.3846/gac.2019.8699. Disponível em: https://journals.vilniustech.lt/index.php/GAC/article/view/8699. Acesso em: 9 may. 2025.