1. 2026
  2. Research on the Qualitative Theory of Differential Equations at St. Petersburg University. The Center–Focus Problem. Phase Portraits of One Family of Cubic Systems

    Andreeva, I. A., Begun, N. A., Vasil’eva, E. V., Zvyagintseva, T. E. & Iljin, Y. A., 1 Mar 2026, In: VESTNIK ST PETERSBURG UNIVERSITY-MATHEMATICS. 59, 1, p. 1-8 8 p.

    Research output: Contribution to journalArticlepeer-review

  3. 2025
  4. Локальная топологическая эквивалентность существенно нелинейных систем дифференциальных уравнений

    Ильин, Ю. А. & Мартынов, К. В., 2025, In: ДИФФЕРЕНЦИАЛЬНЫЕ УРАВНЕНИЯ И ПРОЦЕССЫ УПРАВЛЕНИЯ. 3, p. 98-117 19 p.

    Research output: Contribution to journalArticlepeer-review

  5. 2024
  6. Review of Research on the Qualitative Theory of Differential Equations at St. Petersburg University. II. Locally Qualitative Analysis of Essentially Nonlinear Systems

    Begun, N. A., Il’in, Y. A., Zvyagintseva, T. E. & Vasilieva, E. V., 1 Sep 2024, In: Vestnik St. Petersburg University: Mathematics. 57, 3, p. 271-282 12 p.

    Research output: Contribution to journalArticlepeer-review

  7. 2022
  8. Existence of an Invariant Foliation Near a Locally Integral Surface of Neutral Type

    Il’in, Y., 2022, In: Lobachevskii Journal of Mathematics. 43, 2, p. 378-390

    Research output: Contribution to journalArticlepeer-review

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