ZARIŅŠ, Ansis; RUBANS, Augusts; SILABRIEDIS, Gunārs. Performance analysis of Latvian zenith camera. Geodesy and Cartography, [S. l.], v. 44, n. 1, p. 1–5, 2018. DOI: 10.3846/gac.2018.876. Disponível em: https://mla.vilniustech.lt/index.php/GAC/article/view/876. Acesso em: 15 aug. 2025.