Sumaruk, Yu. P., and T. P. Sumaruk. “Secular Variations of the Geomagnetic Field at the African Plate”. Geofizicheskiy Zhurnal 39, no. 2 (June 1, 2017): 96–108. Accessed November 23, 2024. https://journals.uran.ua/geofizicheskiy/article/view/97375.