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1971, Volume 198, Number 6  


MATHEMATICS
A generalized boundary-value problem for an ordinary linear differential operator
V. Bryuns
1255
On the structure of subelliptic operators
Yu. V. Egorov
1259
Vinogradovís conjecture on the least quadratic nonresidue and representation of numbers by quadratic forms
L. A. Kogan
1263
The projection method for the study of bifurcation of the zero solution of a nonlinear operator equation with multidimensional bifurcation
V. M. Krasnosel'skii
1265
Averaging for systems with variable period
V. V. Laricheva
1269
On multidimensional infinitely divisible laws, all of whose components are infinitely divisible
L. Z. Livshits, I. V. Ostrovskii
1273
On periodic solutions of some nonlinear hyperbolic equations
S. I. Pokhozhaev
1274
On extension of quasi-conformal mappings to multidimensional spaces of greater dimension
R. I. Sedo, A. V. Sychev
1278
Best approximations and absolute convergence of Fourier–Haar series
M. F. Timan, G. Gaimnazarov
1280
An example of a homogeneous bicompactum with noncoincident dimensions
V. V. Fedorchuk
1283
Separable locally compact groups with discrete support for the regular representation
A. I. Shtern
1287

FLUID MECHANICS
On thermal theory of viscous fluid flow
A. G. Merzhanov, A. M. Stolin
1291

THEORY OF ELASTICITY
Torsion of hollow piecewise-homogeneous beams
G. A. Kutateladze
1295

STRENGTH OF MATERIALS
On taking into account thrust friction in the calculations of brittle metal strength
A. I. Markov
1299

PHYSICS
Experimental determination of inverse population in the crystal $\mathrm{CaWO}_4:\mathrm{Nd}^{3+}$
N. K. Bel'skii, D. A. Muhamedova
1303
Measurement of noise level of Langmuir oscillations in the plasma – beam system according to Stark broadening of hydrogen spectral lines
L. P. Zakatov, A. G. Plakhov, V. V. Shapkin, G. V. Sholin
1306
Effect of ion-electron emission relaxation in the interaction of argon ions with the surface of $\mathrm{Ge}$ and $\mathrm{InAs}$
N. M. Omelyanovskaya, S. Ya. Lebedev, O. I. Kapusta
1310

GEOPHYSICS
Indicatrices of atmospheric dust scattering determined according to the twilight-sky luminosity in the Sun vertical
N. B. Divari, Yu. I. Zaginailo
1323
Possible physical-chemical processes of Earth's core formation
O. G. Sorokbtin
1327
 
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