Sulakova, Lubova, and Janis Kaminskis. “The Reduction of Geomagnetic Data for the Territory of Latvia to the Epoch 2021.5”. Geodesy and Cartography 50, no. 1 (April 12, 2024): 30–34. Accessed January 9, 2025. https://jest.vgtu.lt/index.php/GAC/article/view/20996.