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  1. 2020

  2. Упражнения по математическому анализу для студентов базового потока первого курса II семестра: Учебно - методическое пособие

    Филиппенко, Г. В., Гельфрейх, Н. Г. & Багаев, А. А., 2020, Издательство Санкт-Петербургского университета. 31 p.

    Research output: Book/Report/Anthology › Teaching materials › peer-review

  3. 2018

  4. Normal Forms for Three-parameter Families of Area-preserving Maps near an Elliptic Fixed Point

    Гельфрейх, Н. Г., 1 May 2018, In: Regular and Chaotic Dynamics. 23, 3, p. 273-290 18 p.

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

  5. 2014

  6. Unique normal forms near a degenerate elliptic fixed point in two-parametric families of area-preserving maps

    Gelfreich, V. & Gelfreikh, N., 2014, In: Nonlinearity. 27, 7, p. 1645-1667

    Research output: Contribution to journal › Article

  7. 2013

  8. Simplified normal forms near a degenerate elliptic fixed point in two-parametric families of area-preserving maps

    Gelfreich, V. & Gelfreikh, N., 2013, In: arXiv. p. 1312.6154

    Research output: Contribution to journal › Article

  9. 2010

  10. Unique normal forms for area preserving maps near a fixed point with neutral multipliers

    Gelfreich, V. & Gelfreikh, N., 2010, In: Regular and Chaotic Dynamics. 15, 2, 19 p.

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

  11. 2009

  12. Unique resonant normal forms for area-preserving maps at an elliptic fixed point

    Gelfreich, V. & Gelfreikh, N., 24 Jul 2009, In: Nonlinearity. 22, 4, p. 783-810 28 p.

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

  13. 1996

  14. A high-frequency asymptotic expansion of a wave field diffracted at a thin elastic arbitrary cylindrical shell

    Buldyrev, V. S. & Gel'freikh, N. G., 1 Nov 1996, In: Acoustical Physics. 42, 6, p. 662-667 6 p.

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

  15. A high frequency asymptotic expansion of the wave field diffracted at a thin elastic circular shell

    Buldyrev, V. S. & Gel'freikh, N. G., 1 Sep 1996, In: Acoustical Physics. 42, 5, p. 532-536 5 p.

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

ID: 185066