%0 Journal Article %A Yu. A. Ignatov %T Roots of unity as nonfree points of the complex plane %J Matematičeskie zametki %D 1980 %P 825-827 %V 27 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZM_1980_27_5_a12/ %G ru %F MZM_1980_27_5_a12