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@article{ARM_1987__23_1_a7, author = {\v{S}ki\v{l}, N. I.}, title = {O {\cyrp}{\cyre}{\cyrr}{\cyri}{\cyro}{\cyrd}{\cyri}{\cyrch}{\cyre}{\cyrs}{\cyrk}{\cyri}{\cyrh} {\cyrr}{\cyre}{\cyrsh}{\cyre}{\cyrn}{\cyri}{\cyrya}{\cyrh} {\cyrs}{\cyri}{\cyrs}{\cyrt}{\cyre}{\cyrm} {\cyrd}{\cyri}{\cyrf}{\cyrf}{\cyre}{\cyrr}{\cyre}{\cyrn}{\cyrc}{\cyri}{\cyra}{\cyrl}{\cyrsftsn}{\cyrn}{\cyrery}{\cyrh} {\cyru}{\cyrr}{\cyra}{\cyrv}{\cyrn}{\cyre}{\cyrn}{\cyri}{\cyrishrt} {\cyrv}{\cyrt}{\cyro}{\cyrr}{\cyro}{\cyrg}{\cyro} {\cyrp}{\cyro}{\cyrr}{\cyrya}{\cyrd}{\cyrk}{\cyra}}, journal = {Archivum mathematicum}, pages = {53--62}, publisher = {mathdoc}, volume = {23}, number = {1}, year = {1987}, mrnumber = {930548}, zbl = {0652.34047}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/ARM_1987__23_1_a7/} }
Škiľ, N. I. O периодических решениях систем дифференциальных уравнений второго порядка. Archivum mathematicum, Tome 23 (1987) no. 1, pp. 53-62. http://geodesic.mathdoc.fr/item/ARM_1987__23_1_a7/