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@article{MS_1953__74_3_a2, author = {{\CYRA}.{\CYRA}. {\CYRL}{\cyrya}{\cyrp}{\cyru}{\cyrn}{\cyro}{\cyrv}}, title = {{\CYRO}{\cyrt}{\cyrd}{\cyre}{\cyrl}{\cyri}{\cyrm}{\cyro}{\cyrs}{\cyrt}{\cyrsftsn} {\cyri} {\cyrn}{\cyre}{\cyro}{\cyrt}{\cyrd}{\cyre}{\cyrl}{\cyri}{\cyrm}{\cyro}{\cyrs}{\cyrt}{\cyrsftsn} $R$-{\cyrm}{\cyrn}{\cyro}{\cyrzh}{\cyre}{\cyrs}{\cyrt}{\cyrv}}, journal = {Matemati\v{c}eskij sbornik}, pages = {515--532}, publisher = {mathdoc}, volume = {74}, number = {3}, year = {1953}, zbl = {0051.29103}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MS_1953__74_3_a2/} }
А.А. Ляпунов. Отделимость и неотделимость $R$-множеств. Matematičeskij sbornik, Tome 74 (1953) no. 3, pp. 515-532. http://geodesic.mathdoc.fr/item/MS_1953__74_3_a2/