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@article{MS_1949__66_3_a1, author = {{\CYRA}.{\CYRF}. {\CYRL}{\cyre}{\cyro}{\cyrn}{\cyrt}{\cyrsftsn}{\cyre}{\cyrv}}, title = {{\CYRD}{\cyri}{\cyrf}{\cyrf}{\cyre}{\cyrr}{\cyre}{\cyrn}{\cyrc}{\cyri}{\cyra}{\cyrl}{\cyrsftsn}{\cyrn}{\cyro}-{\cyrr}{\cyra}{\cyrz}{\cyrn}{\cyro}{\cyrs}{\cyrt}{\cyrn}{\cyrery}{\cyre} {\cyru}{\cyrr}{\cyra}{\cyrv}{\cyrn}{\cyre}{\cyrn}{\cyri}{\cyrya}}, journal = {Matemati\v{c}eskij sbornik}, pages = {347--374}, publisher = {mathdoc}, volume = {66}, number = {3}, year = {1949}, zbl = {0041.42309}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MS_1949__66_3_a1/} }
А.Ф. Леонтьев. Дифференциально-разностные уравнения. Matematičeskij sbornik, Tome 66 (1949) no. 3, pp. 347-374. http://geodesic.mathdoc.fr/item/MS_1949__66_3_a1/