Periodic solutions of systems of two linear first-order ordinary differential equations with degenerate asymmetric matrix with derivatives von Er’omenko, V. O., Єрьоменко, В. О.

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On periodic solutions of linear degenerate second-order ordinary differential equations von Er’omenko, V. O., Ерёменко, В. А., Ерёменко, В. А.

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Quasiperiodic solutions of degenerate linear systems of second-order ordinary differential equations von Er’omenko, V. O., Aliluiko, A. M., Єрьоменко, В. О., Алілуйко, А. М.

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