F. VALACH, M. VÁCZYOVÁ, and P. DOLINSKÝ, “Geomagnetic field at Slovak repeat stations – the 2004.5 epoch”, Contrib. Geophys. Geod., vol. 36, pp. 73–80, May 2021, Accessed: Feb. 04, 2026. [Online]. Available: https://journals.savba.sk/index.php/cgg/article/view/5034