1. Group analysis of the one-dimensional Boltzmann equation. Invariants and the problem of moment system closure

   • K. S. Platonova
   • A. V. Borovskih

   Research Articles 23 September 2021 Pages: 1165 - 1181

2. Effective wavelength of envelope waves on the water surface beneath an ice sheet: small amplitudes and moderate depths

   • A. T. Il’ichev

   Research Articles 23 September 2021 Pages: 1182 - 1200

   

3. Fractional derivative method for describing solitons on the surface of deep water

   • V. I. Avrutskiy
   • A. M. Ishkhanyan
   • V. P. Krainov

   Research Articles 23 September 2021 Pages: 1201 - 1206

   

4. Notes about the KP/BKP correspondence

   • A. Yu. Orlov

   Research Articles 23 September 2021 Pages: 1207 - 1227

5. Existence and uniqueness of fixed points of an integral operator of Hammerstein type

   • F. H. Haydarov

   Research Articles 23 September 2021 Pages: 1228 - 1238

6. \(\bar\partial\)-dressing method for a few \((2+1)\)-dimensional integrable coupling systems

   • Haifeng Wang
   • Yufeng Zhang

   Research Articles 23 September 2021 Pages: 1239 - 1255

7. Three-dimensional vortices in the Heisenberg model

   • A. B. Borisov

   Research Articles 23 September 2021 Pages: 1256 - 1264

   

8. Relativistic linear oscillator under the action of a constant external force. Wave functions and dynamical symmetry group

   • Sh. N. Nagiyev
   • R. M. Mir-Kasimov

   Research Articles 23 September 2021 Pages: 1265 - 1276

9. Photon structure of stationary spaces

   • K. V. Kobialko
   • D. V. Gal’tsov

   Research Articles 23 September 2021 Pages: 1277 - 1298

   

10. Study on anisotropic strange stars in Rastall gravity

    • I. G. Salako
    • D. R. Boko
    • M. Z. Arouko

    Research Articles 23 September 2021 Pages: 1299 - 1316

    

11. Erratum to: Exponentially confining potential well

    • A. D. Alhaidari

    Erratum 23 September 2021 Pages: 1317 - 1317

12. Erratum to: Relaxation Oscillations in a Logistic Equation with State-in-the-Past-Dependent Delay

    • V. O. Golubenets

    Erratum 23 September 2021 Pages: 1318 - 1318