GRAVITATION, ASTROPHYSICS 
Black hole in an external magnetic field

419

Quantum interferometer as detecting element of a gravitational antenna

428

Gravitational waves and the limiting stability of selfexcited oscillators

433

NUCLEI, PARTICLES, AND THEIR INTERACTIONS 
Scaleinvariant solutions in the hydrodynamic theory of multiple production

435

Solution of the FokkerPlanck equation for a laminar medium

442

Resonant formation of μmesie molecules of hydrogen

444

Influence of multiple reflections on the polarization of nonmonochromatic neutron beams

450

Optical activity of thallium and lead vapors near suppressed M1 transitions

453

ATOMS, SPECTRA, RADIATION 
Optical resonators with periodic boundaries

455

Time dependent spectra of resonant secondary radiation

463

Charge transfer between hydrogen atoms and the nuclei of multicharged ions with allowance for the degeneracy of the final states

469

Absorption line shape of homogeneously broadened degenerate transition

477

Analytic properties of the amplitude for elastic forward scattering of electrons by atoms

484

Coherent fourphoton Rayleigh scattering of light

491

PLASMA, GASES 
Contribution to the theory of the oscillations of a plasmon gas in a weakly turbulent plasma

495

Landau damping in the interaction between a regular wave and noise

499

Possibility of decreasing the electron heat flux from open traps

501

Langmuir solitons

506

Experimental investigation of quasistationary waves excited by periodic injection of electron bunches into plasma

517

SOLIDS, LIQUIDS 
Asymmetric distributions of parametrically excited waves

522

Splitting of ENDOR lines by a strong microwave field

528

Exchange interaction between conduction electrons and localized d(f) electrons with allowance for the nonorthogonality of their wave functions

532

Thermal ionization of impurities in strong electric fields

535

Influence of local anisotropy on the states and resonant properties of an optically oriented system of electron and nuclear spins of semiconductors

539

Effect of electric field on exciton absorption

548

Amplification of polarization echo signals in lithium niobate crystals activated with iron group ions

553

Theory of resonant optical orientation of tunnel centers

557

Absorption of Rayleigh sound in normal metals and superconductors

565

Investigation of the temperature dependence of the effective magnetic fields on Pu nuclei in nickel and iron matrices

570

Renormalization in a onedimensional electronphonon system

574

Quantum effects in aluminum under magnetic breakdown conditions

579

Theory of Mössbauer spectra in the presence of spinspin relaxation

585

Nonlinear electromagnetic absorption of shortwave sound in metals

591

Investigation of the reflection of conduction electrons from the surface of a tungsten sample

597

Kinetics of spatial distribution of electronhole drops

603

Damping of sound in antiferromagnets of the easyplane type with a high Neel temperature

609

Investigation of the dynamic NMR frequency shift for ^{57} Fe in FeBO_{3}

615

Twodimensional model of polymers with excluded volume

619

Effect of the kinematics of the mutual approach of particles in solutions on the transfer of energy between them

623
