Sabaka, T.J., N. Olsen, R.H. Tyler, and A. Kuvshinov (2015), CM5, a pre-Swarm comprehensive geomagnetic field model derived from over 12 yr of CHAMP, Ørsted, SAC-C and observatory data, Geophysical Journal International, 200, 1596-1626, doi:10.1093/gji/ggu493.
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Earth Surface & Interior Program (ESI)