De Santis, A., Gaya-Piqué, L., Dominici, G., Meloni, A., Torta, J.M. and Tozzi, R. 2003. ITalian Geomagnetic Reference Field (ITGRF): update for 2000 and secular variation model up to 2005 by autoregressive forecasting. Annals of Geophysics. 46, 3 (Dec. 2003). DOI:https://doi.org/10.4401/ag-3422.