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1991, Volume 321, Number 3  


MATHEMATICS
Classes of operator $R$-functions and their realization by conservative systems
S. V. Belyi, È. R. Tsekanovskii
441
Fréchet sheaves over a holomorphically complete complex space
V. D. Golovin
446
Multivalued solvability of some elliptic problems in $\mathbf{R}^N$
I. A. Kuzin
449
The method of singular perturbations for differential inclusions
A. B. Kurzhanskii, T. F. Filippova
454
On the accuracy of Tikhonov regularizing algorithms and the quasi-optimal choice of regularization parameter
A. S. Leonov
460
Inversion of Riesz $B$-potentials
L. N. Lyakhov
466
Polynomial interpolation of nonlinear functionals
V. L. Makarov, V. V. Khlobystov
470
Marcinkiewicz-type means of polynomial Fourier expansions
A. D. Nakhman
474
Smoothness of solutions of second-order degenerate quasilinear elliptic equations
A. A. Novruzov, F. I. Mamedov
478
Asymptotic integration of ordinary differential equations with discontinuities in the right-hand side
V. V. Filippov
482
Group pursuit for controlled objects with different time lags
A. A. Chikrii, I. S. Rappoport
486

CYBERNETICS AND THE REGULATION THEORY
New theorems on forced periodic oscillations and bounded solutions
M. A. Krasnosel'skii, J. Moven, A. V. Pokrovskii
491
Series expansion of the Radon transform of functions of several variables in a ball
N. A. Magnitskii
496

MECHANICS
Matrix equations of motion of nonholonomic systems
V. V. Velichenko
499

MATHEMATICAL PHYSICS
Orbital stability of boundary states in the theory of long waves with additional pressure
A. T. Il'ichev, A. Yu. Semenov
505
The kinetics of a percolation lattice as a model of the filtration of an oil stratum
A. R. Kessel, V. I. Gusev
509

PHYSICS
X-ray determination of elastic constants of chalcopyrite
N. N. Sirota, Zh. K. Zhalgasbekova
513
 
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