Smarandache Theorem in Hyperbolic Geometry by Kostin, A.V., Sabitov, I.Kh.

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On asymptotic decompositions of o-solutions in the theory of quasilinear systems of difference equations by Kostin, A.V., Skripnik, I.V.

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Some generalisation of the shadow problem in the Lobachevsky space by Kostin, A. V., Костін , А. В.

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Problem of shadow in the Lobachevski space by Kostin, A. V., Костин, А. В., Костин, А. В.

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On solutions of a second-order quasilinear differential system representable by Fourier series with slowly varying parameters by Kostin, A. V., Shchegolev, S. A., Костин, А. В., Щеголев, С. А., Костин, А. В., Щеголев, С. А.

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On asymptotic decompositions of o-solutions in the theory of quasilinear systems of difference equations by Kostin, A. V., Skrypnik, I. V., Костин, А. В., Скрыпник, И. В., Костин, А. В., Скрыпник, И. В.

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