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@article{MS_1967__115_3_a2, author = {{\CYRM}.{\CYRSH}. {\CYRB}{\cyri}{\cyrr}{\cyrm}{\cyra}{\cyrn} and {\CYRM}.{\CYRZ}. {\CYRS}{\cyro}{\cyrl}{\cyro}{\cyrm}{\cyrya}{\cyrk}}, title = {{\CYRK}{\cyru}{\cyrs}{\cyro}{\cyrch}{\cyrn}{\cyro}-{\cyrp}{\cyro}{\cyrl}{\cyri}{\cyrn}{\cyro}{\cyrm}{\cyri}{\cyra}{\cyrl}{\cyrsftsn}{\cyrn}{\cyrery}{\cyre} {\cyrp}{\cyrr}{\cyri}{\cyrb}{\cyrl}{\cyri}{\cyrzh}{\cyre}{\cyrn}{\cyri}{\cyrya} {\cyrf}{\cyru}{\cyrn}{\cyrk}{\cyrc}{\cyri}{\cyrishrt} {\cyrk}{\cyrl}{\cyra}{\cyrs}{\cyrs}{\cyro}{\cyrv} $W_p^\ensuremath{\alpha}$}, journal = {Matemati\v{c}eskij sbornik}, pages = {331--355}, publisher = {mathdoc}, volume = {115}, number = {3}, year = {1967}, zbl = {0173.16001}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MS_1967__115_3_a2/} }
М.Ш. Бирман; М.З. Соломяк. Кусочно-полиномиальные приближения функций классов $W_p^α$. Matematičeskij sbornik, Tome 115 (1967) no. 3, pp. 331-355. http://geodesic.mathdoc.fr/item/MS_1967__115_3_a2/