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1991, Volume 317, Number 3  


MATHEMATICS
Trace formulas for an even-order differential equation with an unbounded operator coefficient
M. S. Almamedov, M. Bayramoglu, V. I. Katanova
521
On the well-posedness of operator-differential equations of arbitrary order
M. K. Balaev
526
Spectral asymptotics of nonselfadjoint pseudodifferential operators in bounded domains
K. Kh. Boimatov
530
Correct classes of computations in logic programming
Yu. V. Gavrilenko
535
Control of queueing systems in a class of delays
A. G. Gadzhiev
540
On an invariant measure for a nonlinear Schrödinger equation
P. E. Zhidkov
543
Reconstruction of a mapping from a normalized Jacobian matrix
I. V. Zhuravlev
546
Spectral problems for the Sturm–Liouville equation with a parameter. The geometry of finite-gap potentials
I. S. Zakharevich
550
Uniform convexity and local uniform convexity of symmetric spaces of measurable operators
A. V. Krygin, F. A. Sukochev, V. I. Chilin
555
On the estimation of a function of an infinite interval
L. D. Kudryavtsev
559
On the formulation and solvability of a class of boundary value problems for the Lavrent'ev–Bitsadze equation
M. E. Lerner
561
Nonstandard hulls of normed Grassmann algebras and their applications in superanalysis
V. G. Pestov
565
Some properties of solutions of an equation of gravitational-gyroscopic waves
Yu. D. Pletner
570
Some estimates for the Gibbs function for partial sums of Fourier series in $\Lambda$-multiplicative systems
A. S. Pospelov
573
Evolution of resonances under perturbation of a system with constant frequencies
G. V. Sandrakov
576
Reconstruction of potential in a three-dimensional problem in scattering theory
V. S. Serov
579
On the first boundary value problem for a direct-inverse parabolic equation
S. A. Tersenov
584
Extremal selectors of multivalued mappings and the “bang-bang” principle for evolution inclusions
A. A. Tolstonogov
589

CYBERNETICS AND THE REGULATION THEORY
Periodic solutions of some functional equations
S. M. Dzyuba
594
Minimum acceleration energy optimization of control systems
P. D. Krut'ko
596
A two-level representation of a functional system in a hyper-real space
V. F. Yakovlev
600

FLUID MECHANICS
Diffusion in fluid under geostrophic regime of convection
B. M. Bubnov, G. S. Golitsyn
602
Filtration through strata with ring-shaped, nonhomogeneous, anisotropic zones, cracks and screens
S. E. Kholodovskii
606

THE MECHANICS OF CONTINUOUS MEDIUM
Rheological anomalies in gelation process of some polymers swelling dispersions
R. V. Torner, N. V. Kostikova, N. I. Bezuglova, O. M. Lagover, N. P. Privalikhina, V. S. Al'tzitser, V. A. Berestnev
609

THEORY OF ELASTICITY
Endochronous theory of the viscoplasticity of anisotropic solids
Yu. I. Kadashevich, A. B. Mosolov
613

GEOPHYSICS
Subcrustal density inhomogeneities of the Northern Eurasia
M. E. Artem'ev, V. A. Kucherinenko, M. K. Kaban
616
Instability of the $\mathrm{F2}$-area of the ionosphere before the Vranchesk earthquake on 31 August 1986
T. I. Zelenova, V. V. Migulin, M. N. Fatkullin, A. D. Legen'ka, Ts. Pashova, O. I. Maksimenko
620
On the dependence of earthquake power on the age of the basement
V. V. Nikolaev
625
A new version of spline models for description of temperature zonality of the surface of northern hemisphere fresh lakes
S. V. Ryanzhin
628
On the registration of the reaction of substance on an outside irreversible process
M. M. Lavrent'ev, I. A. Eganova, M. K. Lutset, S. F. Fominykh
635
Electron density and potential distribution in the crystal lattice of beryllium oxide
N. N. Sirota, A. M. Kuzmina
639

CRYSTALLOGRAPHY
Crystal structure of terskite $\mathrm{Na}_4\mathrm{Zr}[\mathrm{H}_4\mathrm{Si}_6\mathrm{O}_{18}]$
Z. V. Pudovkina, N. M. Chernitsova
645
 
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