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

1233

Onesoliton cosmological waves

1239

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

1255

Influence of radiation on the motion of channeled particles

1267

Ultracoldneutron storage experiments

1277

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

1282

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

1297

Transient quasiline spectra of resonant secondary emission

1302

Excitation of molecule vibrations in resonant scattering of electrons

1313

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

1326

Radiative collisions between atoms in a bichromatic field

1340

Permutation symmetry of wave functions of a system of identical particles

1348

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

1352

Selfaction of electromagnetic waves in a plasma subject to modulational instability

1360

Evolution of electron distribution function in highfrequency breakdown of a gas

1367

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

1372

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

1382

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

1396

The dielectric constant of magnetic semiconductors

1407

Theory of relaxation of metastable states

1417

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

1432

Capture of photoexcited carrien by shallow impurity centen in germanium

1450

Boundary conditions and critical current of SNS junctions

1463

Quantum defects in superconductors

1471

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

1479

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

1488

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

1503

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

1519

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

1528

Spinphonon interaction in a trigonal crystal

1544

Crystals optics of phases with incommensurable superstructures

1556

Instability and motion of electronhole drops

1575

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

1590

Renormalization group equations and thermodynamic anomalies near the tricritical point

1598

Flexoelectric effect and polarization properties of chiral smectic C liquid crystal

1615

Lowfrequency excitations in systems such as a doped excitonic dielectric

1626

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

1636

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

1643

Density of states in a onedimensional disordered crystal

1649
