Greiner-Mai, H., Jochmann, H., Barthelmes, F. (1998): About the influence of a possible relative rotation of the earth's inner core on the polar motion, the geomagnetic field and the gravity field, (Scientific Technical Report STR ; 98/06), XXII. General Assembly / European Geophysical Society (Nice, France 1998), Potsdam : Deutsches GeoForschungsZentrum GFZ, 15 p.https://doi.org/10.48440/GFZ.b103-980033