GRAVITATION, ASTROPHYSICS 
The Papapetrou and Dixon equations of motion

231

NUCLEI, PARTICLES, AND THEIR INTERACTION 
Oscillations of cross section for photoproduction of an electronpositron pair in an external field

235

The path group and the interaction of quantum strings

239

ATOMS, SPECTRA, RADIATION 
Investigation of kinetic processes in molecular nitrogen by the CARS method

246

Valence electron configurations of tellurium in its compounds, found from the xrayline chemical shift and the isomer shift

251

Impact ionization in semiconductors under the influence of the electric field of an optical wave

256

Threshold energy dependence of the intramolecular vibrational relaxation rate tor an isolated polyatomic molecule

264

PLASMA, GASES 
Particle heating by a lowamplitude wave in an inhomogeneous magnetoactive plasma

272

LIQUIDS 
Surface second sound and kinetic phenomena on the interface between solid helium and He II below 1 K

278

Hydrodynamic equations for the quantum liquidquantum crystal phase interface (T = 0)

288

The thermodynamics of normal Fermisystems

297

SOLIDS 
Vacuumultraviolet spectroscopy and energy spectrum of rareearth molybdates which are improper ferroelectrics

305

Interaction of impurity centers in anisotropic elastic media

312

Change, due to scatteringact correlation, of electron diffusion in a classically strong magnetic field

317

Superconductivity in manyvalley semiconductors

324

Contribution to the theory of reconstruction of the surface of a semiconducting crystal

331

Twofrequency excitation, anisotropy of the intensity, and effects of asymmetry of the tensor of hyperRaman light scattering in crystalline quartz

338

Axial toroidal moments in electrodynamics and solidstate physics

344

Instability of parametric spin wave systems in antiferromagnets

352

Static susceptibility of thin films of quasiuniaxial magnets at phase transitions accompanied by domainstructure formation

357

Effect of "nonlocal" dissipation on the quantum properties of systems in a potential with degenerate minima

369

Indirect exchange in ferromagnets with low carrier densities

379

Phonon pumping of superconductors

386

Line shape and mechanisms of nonlinear cyclotron resonance in bismuth

392

Thermoreflection spectra and electron structure of superconducting alloy Nb3+xGe_{1x}

399

Surface ferromagnetism in transition metals in the Hubbard model

407

Peierls instability in weakly nonideal onedimensional systems

414

Lowtemperature properties of ferromagnets with differention anisotropy and arbitrary site spin

422

Coherent oscillations in small tunnel junctions

427

Reflection of weak perturbations by a shockwave front. Nonlinear analysis

433

Nonergodicity and nonequilibrium character of spin glasses

439

Parametric excitation of spin waves under conditions of frequency drift

447

Quasiparticles and impurities in the quantum Hall effect

455

Phase slippage lines in wide superconducting films

462
