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@article{MP_1957_a17, author = {P. P. Korovkin}, title = {{\CYRO} {\cyrt}{\cyre}{\cyro}{\cyrr}{\cyre}{\cyrm}{\cyra}{\cyrh} {\cyrs}{\cyru}{\cyrshch}{\cyre}{\cyrs}{\cyrt}{\cyrv}{\cyro}{\cyrv}{\cyra}{\cyrn}{\cyri}{\cyrya} {\cyro}{\cyrp}{\cyrr}{\cyre}{\cyrd}{\cyre}{\cyrl}{\cyre}{\cyrn}{\cyrn}{\cyro}{\cyrg}{\cyro} {\cyri}{\cyrn}{\cyrt}{\cyre}{\cyrg}{\cyrr}{\cyra}{\cyrl}{\cyra}}, journal = {Matematicheskoe Prosveshchenie}, pages = {227--233}, publisher = {mathdoc}, year = {1957}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MP_1957_a17/} }
P. P. Korovkin. О теоремах существования определенного интеграла. Matematicheskoe Prosveshchenie, Математика, ее преподавание, приложения и история (1957), pp. 227-233. http://geodesic.mathdoc.fr/item/MP_1957_a17/