SUMARUK, Y. Long-term changes in the geomagnetic field from observational data at magnetic observatories of Ukraine. Geofizicheskiy Zhurnal, [S. l.], v. 33, n. 5, p. 120–127, 2011. DOI: 10.24028/gzh.0203-3100.v33i5.2011.116873. Disponível em: https://journals.uran.ua/geofizicheskiy/article/view/116873. Acesso em: 18 jul. 2024.