SUMARUK, T. P.; SUMARUK, P. V. Peculiarities of the geomagnetic field secular variations at the 20th solar activity cycle. Geofizicheskiy Zhurnal, [S. l.], v. 40, n. 3, p. 179–191, 2018. DOI: 10.24028/gzh.0203-3100.v40i3.2018.137199. Disponível em: https://journals.uran.ua/geofizicheskiy/article/view/137199. Acesso em: 15 apr. 2024.