Matrix periodic boundary-value problems with concentrated delay von S. M. Chujko, D. V. Sysoev

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Seminonlinear matrix boundary-value problem in the case of a parametric resonance von S. M. Chujko, A. S. Chujko, D. V. Sysoev

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Periodic value problem for an equation of Duffing in the critical case von S. M. Chujko, O. V. Nesmelova, D. V. Sysoev

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Autonomous periodic value problem for an equation of Hill's in particular critical case von S. M. Chujko, O. V. Nesmelova, D. V. Sysoev

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