@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/}
}