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@article{MZM_1977_21_2_a4, author = {G. U. Matevosyan}, title = {Analogs of the $N\{\omega\}$ classes in the case of a~circular annulus}, journal = {Matemati\v{c}eskie zametki}, pages = {173--182}, publisher = {mathdoc}, volume = {21}, number = {2}, year = {1977}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1977_21_2_a4/} }
G. U. Matevosyan. Analogs of the $N\{\omega\}$ classes in the case of a~circular annulus. Matematičeskie zametki, Tome 21 (1977) no. 2, pp. 173-182. http://geodesic.mathdoc.fr/item/MZM_1977_21_2_a4/