NUCLEI, PARTICLES, AND THEIR INTERACTION 
Possibility of investigating P and Todd nuclear forces in atomic and molecular experiments

873

Forbidden betadecay in the field of a strong electromagnetic wave

884

ATOMS, SPECTRA, RADIATION 
Nonlinearoptics phenomena due to dissipative or nonstationary processes

890

Superradiance and dissipative instability in an inverted twolevel system

897

Stimulated Brillouin scattering with distributed feedback

906

Selfinduced transparency when the resonance energy levels are degenerate

913

Raman photon echo

920

Rigorous theory of cooperative spontaneous emission of radiation from a lumped system of twolevel atoms: Bethe ansatz method

927

PLASMA, GASES 
The scarab transformation and magnetic analogies for threedimensional curves in connection with a certain class of extremaIs

935

Cyclotron resonance in ionic spectra

940

Cyclotron absorption of fastmagnetosonic wave in a stellarator

946

Wave interaction in an active conservative medium

948

LIQUIDS 
Thermomechanical effects in deformed nematlcs

953

Contribution to the hydrodynamics of an anisotropic superfluid

959

Features of local field in nematic and cholesteric liquid crystals with small optic anisotropy

968

Anomalously fast convergence of a doublingtype bifurcation chain in systems with two saddle equilibria

974

New type of orbital waves in nematic liquid crystals

977

Longrange correlations and anisotropy in simple liquids and gases near the surfaces of solids

984

SOLIDS 
New classes of exact solutions of the Schrodinger equation and potentialfield description of spin systems

991

Influence of phonon interaction on the linewidth and line profile in Brillouin scattering of light

997

Experimental investigation of magnetoimpurity oscillations in gallium arsenide

1003

A new mechanism of the tilt effect in the interaction between electrons and sound in metals located in weak magnetic fields

1010

The effect of ordered submonolayer oxygen films on the electrical resistance of thin tungsten plates

1015

Magnetostriction of crystals exhibiting the cooperative JahnTeller effect

1020

Spin states in a discrete Peierls model

1026

Screening in a system with localized electrons

1031

The change in the energy spectrum of an exciton moving transverse to a magnetic field

1037

Lowfrequency absorption of a transverse magnetic field in inhomogeneously broadened paramagnetic systems

1040

Plasmondiffraction resonance during motion of a fast charged particle in a single crystal

1046

Theory of transverse runaway of hot electrons

1055

Current damping in superconducting junctions with nonequilibrium electron distribution functions

1060

Tunneling transitions in a complex valence band in a semiconductor

1068

Magnetic symmetry of the domain walls in magnetically ordered crystals

1072

An investigation of the isotope effect in SnM0_{6}S_{8}

1081
