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@article{MS_1966__111_1_a5, author = {O.A. {\CYRO}{\cyrl}{\cyre}{\cyrishrt}{\cyrn}{\cyri}{\cyrk}}, title = {{\CYRO} {\cyrl}{\cyri}{\cyrn}{\cyre}{\cyrishrt}{\cyrn}{\cyrery}{\cyrh} {\cyru}{\cyrr}{\cyra}{\cyrv}{\cyrn}{\cyre}{\cyrn}{\cyri}{\cyrya}{\cyrh} {\cyrv}{\cyrt}{\cyro}{\cyrr}{\cyro}{\cyrg}{\cyro} {\cyrp}{\cyro}{\cyrr}{\cyrya}{\cyrd}{\cyrk}{\cyra} {\cyrs} {\cyrn}{\cyre}{\cyro}{\cyrt}{\cyrr}{\cyri}{\cyrc}{\cyra}{\cyrt}{\cyre}{\cyrl}{\cyrsftsn}{\cyrn}{\cyro}{\cyrishrt} {\cyrh}{\cyra}{\cyrr}{\cyra}{\cyrk}{\cyrt}{\cyre}{\cyrr}{\cyri}{\cyrs}{\cyrt}{\cyri}{\cyrch}{\cyre}{\cyrs}{\cyrk}{\cyro}{\cyrishrt} {\cyrf}{\cyro}{\cyrr}{\cyrm}{\cyro}{\cyrishrt}}, journal = {Matemati\v{c}eskij sbornik}, pages = {111--140}, publisher = {mathdoc}, volume = {111}, number = {1}, year = {1966}, zbl = {0146.34203}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MS_1966__111_1_a5/} }
O.A. Олейник. О линейных уравнениях второго порядка с неотрицательной характеристической формой. Matematičeskij sbornik, Tome 111 (1966) no. 1, pp. 111-140. http://geodesic.mathdoc.fr/item/MS_1966__111_1_a5/