[1]
Sumaruk, Y. and Reda, J. 2011. Secular variations of the geomagnetic field and solar activity. Geofizicheskiy Zhurnal. 33, 4 (Aug. 2011), 134–141. DOI:https://doi.org/10.24028/gzh.0203-3100.v33i4.2011.116902.