Periodic solutions of a system of differential equations with hysteresis nonlinearity in the presence of eigenvalue zero за авторством Yevstafyeva, V. V., Евстафьева, В. В., Евстафьева, В. В.

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Existence of two-point oscillatory solutions of a relay nonautonomous system with a multiple eigenvalue of a real symmetric matrix за авторством Yevstafyeva , V. V., Євстаф’єва , В. В., Євстаф’єва , В. В.

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