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WikiPedia: Sự_kiện_Laschamp http://www.economist.com/science/displaystory.cfm?... http://www.newscientist.com/article/dn9148-ships-l... http://adsabs.harvard.edu/abs/1989PEPI...56..133O http://es.ucsc.edu/~glatz/geodynamo.html http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea... http://www.agu.org/sci_soc/hoffman.html //dx.doi.org/10.1016%2F0012-821x(69)90159-9 https://commons.wikimedia.org/wiki/Category:Geophy...