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@article{MP_1958_a25, author = {I. M. Yaglom}, title = {{\CYRG}.~{\CYRR}{\cyri}{\cyrn}{\cyrg}{\cyre}{\cyrl}{\cyrsftsn}. {{\CYRN}{\cyro}{\cyrv}{\cyrery}{\cyre}} {\cyrr}{\cyre}{\cyrz}{\cyru}{\cyrl}{\cyrsftsn}{\cyrt}{\cyra}{\cyrt}{\cyrery}, {\cyro}{\cyrt}{\cyrn}{\cyro}{\cyrs}{\cyrya}{\cyrshch}{\cyri}{\cyre}{\cyrs}{\cyrya} {\cyrk}~{\cyrp}{\cyrr}{\cyro}{\cyrb}{\cyrl}{\cyre}{\cyrm}{\cyre} {\cyrch}{\cyre}{\cyrt}{\cyrery}{\cyrr}{\cyre}{\cyrh} {\cyrk}{\cyrr}{\cyra}{\cyrs}{\cyro}{\cyrk}}, journal = {Matematicheskoe Prosveshchenie}, pages = {265--266}, publisher = {mathdoc}, year = {1958}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MP_1958_a25/} }
I. M. Yaglom. Г.~Рингель. Новые результаты, относящиеся к~проблеме четырех красок. Matematicheskoe Prosveshchenie, Математика, ее преподавание, приложения и история (1958), pp. 265-266. http://geodesic.mathdoc.fr/item/MP_1958_a25/