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@article{MZM_1968_3_6_a8, author = {I. A. Ibragimov}, title = {On a~theorem of {G.~Szeg\"o}}, journal = {Matemati\v{c}eskie zametki}, pages = {693--702}, publisher = {mathdoc}, volume = {3}, number = {6}, year = {1968}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1968_3_6_a8/} }
I. A. Ibragimov. On a~theorem of G.~Szeg\"o. Matematičeskie zametki, Tome 3 (1968) no. 6, pp. 693-702. http://geodesic.mathdoc.fr/item/MZM_1968_3_6_a8/