%0 Journal Article %A A. T. Lukashenko %T Description of a potential vector field without sources near null points of higher orders in 3D space %J Vestnik Moskovskogo universiteta. Matematika, mehanika %D 2016 %P 18-22 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/VMUMM_2016_4_a2/ %G ru %F VMUMM_2016_4_a2