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

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

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Oleksandr Panteleimonovych Rudenko (to the 80th an-niversary of his birthday) by L. Bulavin, P. Cholpan, Y. Zabashta, M. Kulish, O. Chalyi, V. Sysoev, L. Poperenko, O. Alekseev, M. Malomuzh, O. Svechnikova, Y. Moskalenko, O. Khorolskyi

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