%0 Journal Article %A I. E. Nachasova %A K. S. Burakov %T Geomagnetic field intensity variations for last 4000 years according %J Doklady Akademii Nauk %D 1997 %P 255-257 %V 353 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1997_353_2_a13/ %G ru %F DAN_1997_353_2_a13