Research output

1. Research on the Qualitative Theory of Differential Equations at St. Petersburg University. The Center–Focus Problem. Phase Portraits of One Family of Cubic Systems

   Research output: Contribution to journal › Article › peer-review

2. Исследования по качественной теории дифференциальных уравнений в Санкт-Петербургском университете. Проблема различения центра и фокуса. Фазовые портреты одного семейства кубических систем.

   Research output: Contribution to journal › Article › peer-review

3. A Review of Research on the Qualitative Theory of Differential Equations at St. Petersburg University. III. Systems with Hysteresis Nonlinearities: The Aizerman Problem for Discrete-Time Systems

   Research output: Contribution to journal › Article › peer-review

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