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@article{MS_1952__72_1_a14, author = {{\CYRM}.{\CYRG}. {\CYRK}{\cyrr}{\cyre}{\cyrishrt}{\cyrn} and M.A. {\CYRK}{\cyrr}{\cyra}{\cyrs}{\cyrn}{\cyro}{\cyrs}{\cyre}{\cyrl}{\cyrsftsn}{\cyrs}{\cyrk}{\cyri}{\cyrishrt}}, title = {{\CYRU}{\cyrs}{\cyrt}{\cyro}{\cyrishrt}{\cyrch}{\cyri}{\cyrv}{\cyro}{\cyrs}{\cyrt}{\cyrsftsn} {\cyri}{\cyrn}{\cyrd}{\cyre}{\cyrk}{\cyrs}{\cyra} {\cyrn}{\cyre}{\cyro}{\cyrg}{\cyrr}{\cyra}{\cyrn}{\cyri}{\cyrch}{\cyre}{\cyrn}{\cyrn}{\cyro}{\cyrg}{\cyro} {\cyro}{\cyrp}{\cyre}{\cyrr}{\cyra}{\cyrt}{\cyro}{\cyrr}{\cyra}}, journal = {Matemati\v{c}eskij sbornik}, pages = {219--224}, publisher = {mathdoc}, volume = {72}, number = {1}, year = {1952}, zbl = {0048.09402}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MS_1952__72_1_a14/} }
М.Г. Крейн; M.A. Красносельский. Устойчивость индекса неограниченного оператора. Matematičeskij sbornik, Tome 72 (1952) no. 1, pp. 219-224. http://geodesic.mathdoc.fr/item/MS_1952__72_1_a14/