1. Multicomponent fractional Volterra hierarchy and its subhierarchy with Virasoro symmetry

   • Chuanzhong Li

   Research Articles 21 June 2021 Pages: 397 - 414

2. Riemann–Hilbert problem for the Kundu-type nonlinear Schrödinger equation with \(N\) distinct arbitrary-order poles

   • Zi-Yi Wang
   • Shou-Fu Tian
   • Xiao-Fan Zhang

   Research Articles 21 June 2021 Pages: 415 - 433

   

3. Anisotropic solutions for a holographic heavy-quark model with an external magnetic field

   • I. Ya. Aref’eva
   • K. A. Rannu
   • P. S. Slepov

   Research Articles 21 June 2021 Pages: 434 - 446

   

4. Angular part of the Schrödinger equation for the Hautot potential as a harmonic oscillator with a coordinate-dependent mass in a uniform gravitational field

   • E. I. Jafarov
   • S. M. Nagiyev

   Research Articles 21 June 2021 Pages: 447 - 458

5. Low-energy asymptotics of the phases of two-dimensional scattering of a quantum particle by a central long-range potential

   • V. V. Pupyshev

   Research Articles 21 June 2021 Pages: 459 - 482

6. Limit distribution of the nodal domain number for the right-isosceles triangle billiard

   • M. Jain
   • B. Bamal
   • S. R. Jain

   Research Articles 21 June 2021 Pages: 483 - 486

7. The number of endpoints of a random walk on a semi-infinite metric path graph

   • V. L. Chernyshev
   • D. S. Minenkov
   • A. A. Tolchennikov

   Research Articles 21 June 2021 Pages: 487 - 493

   

8. Problem of determining the speed of sound and the memory of an anisotropic medium

   • A. A. Rahmonov
   • U. D. Durdiev
   • Z. R. Bozorov

   Research Articles 21 June 2021 Pages: 494 - 513

9. Complete cosmological model based on an asymmetric scalar Higgs doublet

   • Yu. G. Ignat’ev
   • I. A. Kokh

   Research Articles 21 June 2021 Pages: 514 - 552