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@article{DAN_1962_146_1_a0, author = {A. F. Andreev}, title = {A sharpening of the uniqueness theorem for an $O$-curve in $N_2$}, journal = {Doklady Akademii Nauk}, pages = {9--10}, publisher = {mathdoc}, volume = {146}, number = {1}, year = {1962}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1962_146_1_a0/} }
A. F. Andreev. A sharpening of the uniqueness theorem for an $O$-curve in $N_2$. Doklady Akademii Nauk, Tome 146 (1962) no. 1, pp. 9-10. http://geodesic.mathdoc.fr/item/DAN_1962_146_1_a0/