Orlyuk, M., Romenets, A. V., Sumaruk, P. V., Sumaruk, Y. P., & Sumaruk, T. P. (2012). The spatial-temporal structure of the magnetic field of Ukraine’s territory: assessment of the contribution of internal and external sources. Geofizicheskiy Zhurnal, 34(3), 137–144. https://doi.org/10.24028/gzh.0203-3100.v34i3.2012.116651