Volvach, A. E., and G. S. Kurbasova. “Secular Variations of Geomagnetic Declination in the Karadag Point and the Global Helio-Geodynamic Processes”. Geofizicheskiy Zhurnal 41, no. 1 (March 18, 2019): 192–199. Accessed November 23, 2024. https://journals.uran.ua/geofizicheskiy/article/view/158873.