GRAVITATION, ASTROPHYSICS 
Bremsstrahlung of gravitons

825

NUCLEI, PARTICLES, AND THEIR INTERACTION 
Passage of ultrarelativistic positronium atoms through matte

827

Logarithmic perturbation theory for a screened Coulomb potential and a charmonium potential

833

Investigation of the energy dependence of the spinspin correlation in the diprotonresonance region
N.S. Borisov, V.G. Vovchenko, V.A. Efimovykh, A.A. Zhdanov, M. Yu. Kazarinov, Yu. M. Kazarinov, Yu. F. Kiselev, A.I. Kovalev, M. Yu. Liburg, B.S. Neganov, V.V. Polyakov, V.E. Popov, A.N. Prokof'ev, V. Yu. Trautman, Yu. A. Usov, A.V. Shvedchikov

841

ATOMS, SPECTRA, RADIATION 
Distribution of photocounts in nonlinear resonance fluorescence

848

Conditions of applicability of the quasiclassical approximation in threedimensional problems

852

Contribution to the theory of the effect of orientation of atoms produced in photodissociation of molecules

855

Selfoscillation and multistability due to the nonresonant dynamic Stark effect in a resonator with a medium consisting of twolevel particles

862

Broadening of spectral lines and distribution of the velocities of electronexcited molecules in a nonequilibrium plasma

865

Theory of spontaneous emission of x rays from relativistic channeled particles

872

Interaction of intense radiation with classically rotating atoms or molecules

877

Xray Cherenkov radiation. Theory and experiment

884

Ionization of a hydrogenlike atom by slow ions

893

Dynamic Stark effect in transitions from a discrete level to a continuum

899

PLASMA, GASES 
Collisionless relaxation of phase oscillations of particles trapped by accelerating waves

903

Character of decay instability

906

Hydrodynamic model of plasma "corona" produced when a chargedparticle beam acts on a target

910

Strong particle scattering in a random inhomogeneous magnetic field

915

LIQUIDS 
Magnetohydrodynamics of superfluid solutions

919

Fluctuations of the director of a nematic liquid crystal in a cell of finite thickness

922

Generalized Cauchy relation and elastic constants for liquid metals

927

Relaxation processes and propagation of ultrasound in nematic liquid crystals

931

Generation of the second optical harmonic induced by an electric field in nematic and smectic liquid crystals

935

SOLIDS 
Plasma waves in a randomly inhomogeneous metal

939

Effect of external fields and impurities on the Josephson current in SNINS junctions

944

Magnetic properties of an excitonic dielectric with a real spectrum

955

Quasionedimensional Peierls dielectric in a constant electric field

959

Diffraction of the surface polaritons by an impedance step in the region of resonance with oscillations in a transition layer

968

On the theory of the thermal resistance of the intermediate state of superconductors

974

Dielectric matrix of band electrons with allowance for exchangecorrelation effects

978

Sound absorption in metals above the Debye temperature

985

On the theory of the Fröhlich conductivity of a conductor with a commensurable charge density wave

992

Conductivity of onedimensional incommensurate system

1001

Investigations of the nonlinear dynamics of domain walls in yttrium orthoferrite by the method of highspeed photography

1005

Magnetic susceptibility near a phase transition into the current state

1008

Parametric excitation of spin waves in the antiferromagnet FeBO_{3}

1013

Magnetoacoustic phenomena in ferromagnets with itinerant electrons

1020

Hightemperature expansion of the thermodynamic functions of the electrons in the impurity band

1028

Quantum oscillations of the rf impedance of cadmium plates

1032
