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@article{MP_1958_a12, author = {V. I. Levin}, title = {{\CYREREV}{\cyrl}{\cyre}{\cyrm}{\cyre}{\cyrn}{\cyrt}{\cyra}{\cyrr}{\cyrn}{\cyro}{\cyre} {\cyrd}{\cyro}{\cyrk}{\cyra}{\cyrz}{\cyra}{\cyrt}{\cyre}{\cyrl}{\cyrsftsn}{\cyrs}{\cyrt}{\cyrv}{\cyro} {\cyro}{\cyrd}{\cyrn}{\cyro}{\cyrishrt} {\cyrt}{\cyre}{\cyro}{\cyrr}{\cyre}{\cyrm}{\cyrery} {\cyrt}{\cyre}{\cyro}{\cyrr}{\cyri}{\cyri} {\cyrs}{\cyrr}{\cyre}{\cyrd}{\cyrn}{\cyri}{\cyrh}}, journal = {Matematicheskoe Prosveshchenie}, pages = {177--181}, publisher = {mathdoc}, year = {1958}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MP_1958_a12/} }
V. I. Levin. Элементарное доказательство одной теоремы теории средних. Matematicheskoe Prosveshchenie, Математика, ее преподавание, приложения и история (1958), pp. 177-181. http://geodesic.mathdoc.fr/item/MP_1958_a12/