Zariņš, Ansis, Augusts Rubans, and Gunārs Silabriedis. “Performance Analysis of Latvian Zenith Camera”. Geodesy and Cartography 44, no. 1 (April 30, 2018): 1-5. Accessed January 9, 2025. https://jest.vgtu.lt/index.php/GAC/article/view/876.