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@article{MZM_1980_27_5_a12, author = {Yu. A. Ignatov}, title = {Roots of unity as nonfree points of the complex plane}, journal = {Matemati\v{c}eskie zametki}, pages = {825--827}, publisher = {mathdoc}, volume = {27}, number = {5}, year = {1980}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1980_27_5_a12/} }
Yu. A. Ignatov. Roots of unity as nonfree points of the complex plane. Matematičeskie zametki, Tome 27 (1980) no. 5, pp. 825-827. http://geodesic.mathdoc.fr/item/MZM_1980_27_5_a12/