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@article{MS_1949__67_2_a4, author = {{\CYRA}.{\CYRV}. {\CYRP}{\cyro}{\cyrg}{\cyro}{\cyrr}{\cyre}{\cyrl}{\cyro}{\cyrv}}, title = {{\CYRK}{\cyrv}{\cyra}{\cyrz}{\cyri}-{\cyrg}{\cyre}{\cyro}{\cyrd}{\cyre}{\cyrz}{\cyri}{\cyrch}{\cyre}{\cyrs}{\cyrk}{\cyri}{\cyre} {\cyrl}{\cyri}{\cyrn}{\cyri}{\cyri} {\cyrn}{\cyra} {\cyrv}{\cyrery}{\cyrp}{\cyru}{\cyrk}{\cyrl}{\cyro}{\cyrishrt} {\cyrp}{\cyro}{\cyrv}{\cyre}{\cyrr}{\cyrh}{\cyrn}{\cyro}{\cyrs}{\cyrt}{\cyri}}, journal = {Matemati\v{c}eskij sbornik}, pages = {275--306}, publisher = {mathdoc}, volume = {67}, number = {2}, year = {1949}, zbl = {0041.08902}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MS_1949__67_2_a4/} }
А.В. Погорелов. Квази-геодезические линии на выпуклой поверхности. Matematičeskij sbornik, Tome 67 (1949) no. 2, pp. 275-306. http://geodesic.mathdoc.fr/item/MS_1949__67_2_a4/