Babak, V., I. Rokityanskiy, and A. Tereshyn. “Variations of Induction Vector in North America”. Geofizicheskiy Zhurnal 36, no. 6 (December 1, 2014): 183–187. Accessed April 20, 2024. https://journals.uran.ua/geofizicheskiy/article/view/111064.