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Yohan Guyodo, Jean-Pierre Valet: Global changes in intensity of the Earth's magnetic field during the past 800kyr. In: Nature. Band399, 1. Mai 1999, ISSN0028-0836, S.249–252, doi:10.1038/20420, bibcode:1999Natur.399..249G.
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Magnetospheres. In: NASA Science. NASA, abgerufen am 9. November 2022.
Yohan Guyodo, Jean-Pierre Valet: Global changes in intensity of the Earth's magnetic field during the past 800kyr. In: Nature. Band399, 1. Mai 1999, ISSN0028-0836, S.249–252, doi:10.1038/20420, bibcode:1999Natur.399..249G.