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1989, Volume 305, Number 4  


MATHEMATICS
Vibrational effects in linear and nonlinear systems
V. I. Zubov
777
Semantics and logic of computational problems
M. I. Kanovich
778
The maximum principle for systems of second-order equations of mixed type
K. B. Sabitov
783
Applications of multipliers in S. L. Sobolev spaces to $L_p$-coercivity of the Neumann problem
T. O. Shaposhnikova
786

CYBERNETICS AND THE REGULATION THEORY
Problems of optimal management of a fishery with competing fish populations in the Azov Sea
I. I. Vorovich, Yu. A. Dombrovskii, N. I. Obushchenko, F. A. Surkov
790
On the theory of optimal processes in nonlinear control systems
V. V. Martynenko
794

MECHANICS
Some peculiarities of the flow around bodies moving in two-phase (gas-solid particles) media and in presence of the effect of particle breaking
I. A. Dukhovskii, P. I. Kovalev
799
Nonlinear resonance interactions of longitudinal and flexural waves in an annulus
D. A. Kovrigin, A. I. Potapov
803

FLUID MECHANICS
On the motion of a singular vortex and its mass
S. T. Belyaev, Yu. K. Krasnov
808
On the motion of two spheroidal particles in a nonuniformly heated gas
M. N. Gaidukov, Yu. I. Yalamov, M. M. Li
811
On Cauchy–Poisson waves in the presence of singularities of sink type at the beach edge
B. N. Rumyantsev
816

ASTRONOMY
Perfect cosmological principle and the Hubble effect
P. N. Kropotkin
820

GEOPHYSICS
On the effect of galactic cosmic rays on the formation of spring maximum of the ozone total content in polar and subpolar regions
V. V. Osetchkin, E. V. Gnilovskoy, K. V. Kondratovich
825
On the nature of the geophysical medium discontinuity
Ya. N. Khamidullin
828

MATHEMATICAL PHYSICS
Modelling of $3$-dimensional periodic structures in ferromagnetic films
S. G. Osipov, V. V. Ternovskii, M. M. Khapaev
831
The index theorem in the algebra of quantum observables
B. V. Fedosov
835

PHYSICS
On the stimulation mechanisms of intranuclear transitions in hot plasma
R. V. Arutyunyan, L. A. Bol'shov
839
Formation of nonlinear structures in exactly solvable dissipative systems
A. E. Borovik, V. Yu. Popkov, V. N. Robuk
841
Effect of radiation defects, induced by ion implantation, on electronic properties of $\mathrm{PbTe}$
N. S. Lidorenko, Z. M. Dashevskii, S. A. Kaz'min, V. I. Kaidanov, M. P. Rulenko
844
Relativistic theory of gravity as a theory with broken gauge group
A. A. Logunov, Yu. M. Loskutov
848

CRYSTALLOGRAPHY
Three-dimensional structure of human somatotropin at $3\mathring{\mathrm{A}}$ resolution
A. G. Pavlovskii, S. N. Borisova, B. V. Strokopytov, A. A. Vagin, B. K. Vaĭnshteĭn, G. A. Alkimavichius, V. I. Naktinis, E.-A. A. Yanulaitis, P. M. Rubtsov, K. G. Skryabin, A. A. Baev
861
Volume properties of silicon in solid, solid-liquid, and liquid states
Yu. N. Taran-Zhovnir, N. M. Kochegura, S. P. Kazachkov, V. R. Pilipchuk, E. A. Markovskii, V. Z. Kutsova, K. V. Uzlov
865
A new type of silicate radical in the structure of grumantite, $\mathrm{Na}[\mathrm{Si}_2\mathrm{O}_4(\mathrm{OH})]\cdot\mathrm{H}_2\mathrm{O}$
N. Ya. Yamnova, D. Yu. Pushcharovskii, V. I. Andrianov, R. K. Rastsvetaeva, A. P. Khomyakov, M. G. Mikheeva
868
 
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