Maus, S., Rother, M., Hemant, K., Stolle, C., Lühr, H., Kuvshinov, A., Olsen, N. (2006): Earth's lithospheric magnetic field determined to spherical harmonic degree 90 from CHAMP satellite measurements. - Geophysical Journal International, 164, 2, 319-330.https://doi.org/10.1111/j.1365-246X.2005.02833.x