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@article{MS_1951__71_1_a11, author = {{\CYRS}.{\CYRB}. {\CYRS}{\cyrt}{\cyre}{\cyrch}{\cyrk}{\cyri}{\cyrn}}, title = {{\CYRO}{\cyrb} {\cyra}{\cyrb}{\cyrs}{\cyro}{\cyrl}{\cyryu}{\cyrt}{\cyrn}{\cyro}{\cyrishrt} {\cyrs}{\cyrh}{\cyro}{\cyrd}{\cyri}{\cyrm}{\cyro}{\cyrs}{\cyrt}{\cyri} {\cyro}{\cyrr}{\cyrt}{\cyro}{\cyrg}{\cyro}{\cyrn}{\cyra}{\cyrl}{\cyrsftsn}{\cyrn}{\cyrery}{\cyrh} {\cyrr}{\cyrya}{\cyrd}{\cyro}{\cyrv}. {I}}, journal = {Matemati\v{c}eskij sbornik}, pages = {225--232}, publisher = {mathdoc}, volume = {71}, number = {1}, year = {1951}, zbl = {0043.28803}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MS_1951__71_1_a11/} }
С.Б. Стечкин. Об абсолютной сходимости ортогональных рядов. I. Matematičeskij sbornik, Tome 71 (1951) no. 1, pp. 225-232. http://geodesic.mathdoc.fr/item/MS_1951__71_1_a11/