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@article{DAN_1971_196_6_a7, author = {V. N. Sudakov}, title = {On a problem of {Birkhoff}}, journal = {Doklady Akademii Nauk}, pages = {1280--1282}, publisher = {mathdoc}, volume = {196}, number = {6}, year = {1971}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1971_196_6_a7/} }
V. N. Sudakov. On a problem of Birkhoff. Doklady Akademii Nauk, Tome 196 (1971) no. 6, pp. 1280-1282. http://geodesic.mathdoc.fr/item/DAN_1971_196_6_a7/