Gregori GP, Dong WJ, Gao XQ, Gizzi FT. The separation of the geomagnetic field originated in the core, in the asthenosphere, and in the crust. Ann. Geophys. [Internet]. 1999Nov.25 [cited 2024May4];42(2). Available from: https://www.annalsofgeophysics.eu/index.php/annals/article/view/3713