Ørsted Initial Field ModelNils Olsen, Coerte V. Voorhies, Torsten Neubert et al.|Geophysical Research Letters|2000Cited by 140
Definitive IGRF models for 1945, 1950, 1955, and 1960.R. A. Langel, R. H. Estes, D. R. Barraclough et al.|Journal of geomagnetism and geoelectricity|1988Cited by 27