MANOUSSAKIS, Gerassimos; MILAS, Paraskevas. On the existence of neutral directions of the normal gravity field. Contributions to Geophysics and Geodesy, [S. l.], v. 44, n. 1, p. 41–60, 2014. DOI: 10.2478/congeo-2014-0003. Disponível em: https://journals.savba.sk/index.php/cgg/article/view/5193. Acesso em: 4 feb. 2026.