1. D. Abramova, S. Filippov, T. Zvereva, and A. Frunze, “Use One-Day Reference Field Models on CHAMP Data over Kursk Region,” in Proceedings of the IAGA 2005 Scientific Assembly, Toulouse, 2005.
2. E. B. Fainberg, “Division of Geomagnetic Fields into Normal and Anomalous Parts,” Geomagn. Aeron. 15(1), 144–148 (1975).
3. V. P. Golovkov and T. I. Zvereva, “The Space-Time Pattern of Midlatitude Geomagnetic Variations,” Geomagn. Aeron. 40(1), 84–92 (2000) [Geomagn. Aeron. 40, 77–85 (2000)].
4. V. P. Golovkov and T. I. Zvereva, “Expansion of Geomagnetic Variations within a Year in Natural Orthogonal Components,” Geomagn. Aeron. 38(3), 140–145 (1998) [Geomagn. Aeron. 38, 368–372 (1998)].
5. V. P. Golovkov, T. I. Zvereva, and T. A. Chernova, “Space-Time Modeling of the Main Magnetic Field by Combined Methods of Spherical Harmonic Analysis and Natural Orthogonal Components,” Geomagn. Aeron. 147(2), 272–278 (2007) [Geomagn. Aeron. 47, 256–262 (2007)].