GRAVITATION, ASTROPHYSICS 
Some stationary generalizations of planewave solutions of general relativity theory

621

Onesoliton cosmological waves

623

NUCLEI, PARTICLES, AND THEIR. INTERACTION 
Scattering of slow neutrons by rotating systems of identical nuclei

632

Influence of radiation on the motion of channeled particles

637

Ultracoldneutron storage experiments

642

ATOMS, SPECTRA, RADIATION 
Synchronous nonlinear wave interaction in Bragg diffraction in media with periodic structure

645

Resonance processes in a twolevel system in the presence of nonresonance fields

652

Transient quasiline spectra of resonant secondary emission

655

Excitation of molecule vibrations in resonant scattering of electrons

660

Quantum restrictions on the measurement of the parameters of motion of a macroscopic oscillator

667

Radiative collisions between atoms in a bichromatic field

674

Permutation symmetry of wave functions of a system of identical particles

678

PLASMA, GASES 
Nonlinear periodic motions in a gas of noninteracting particles

681

Selfaction of electromagnetic waves in a plasma subject to modulational instability

684

Evolution of electron distribution function in highfrequency breakdown of a gas

688

Influence of oscillations of plasma particles in a radial potential well on the beamplasma interaction

690

The effects of the interaction between ionsound solitons and resonance particles in a plasma

695

SOLIDS, LIQUIDS 
Contribution to the theory of nonlinear photoelasticity of solids

701

The dielectric constant of magnetic semiconductors

707

Theory of relaxation of metastable states

712

Microscopictheory equations of the dynamics of an electronion system of a metal

719

Capture of photoexcited carrien by shallow impurity centen in germanium

728

Boundary conditions and critical current of SNS junctions

735

Quantum defects in superconductors

738

Bound states of a heavy hole and a phonon in the case of a valence band with a degeneracy point

743

Effect of the interaction between nondegenerate electrons localized in a thin surface layer on the cyclotron resonance and on the magnetoconductance

747

Multimode JahnTeller effect for T term. Case of prevailing coupling with E vibrations

754

Selfinduced transparency is a diphenyl crystal containing pyrene and excited by its own stimulated emission

761

Orientational phase transition and the intermediate state of the monoclinic antiferromagnet NiWO_{4} in a longitudinal external field

766

Spinphonon interaction in a trigonal crystal

774

Crystals optics of phases with incommensurable superstructures

780

Instability and motion of electronhole drops

790

Change in the local geometry of the Fermi surface and the anomaly of the electronic sound absorption coefficient

797

Renormalization group equations and thermodynamic anomalies near the tricritical point

802

Flexoelectric effect and polarization properties of chiral smectic C liquid crystal

811

Lowfrequency excitations in systems such as a doped excitonic dielectric

816

Interaction between twodimensional plasmons and acoustic waves caused by the deformation potential

821

Effect of pressure on the hyperfine magnetic fields at the nuclei of iron impurity atoms in antiferromagnetic chromium

824

Density of states in a onedimensional disordered crystal

827
