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1975, Volume 225, Number 6  


MATHEMATICS
An application of a theorem of Moser to the investigation of differential equations of nonlinear oscillations
Yu. N. Bibikov
1241
Pseudodifferential operators on the Heisenberg group
A. S. Dynin
1245
Qualitative investigation of the spectra of differential-difference operators
A. G. Kamenskii
1249
On the conditions of Dunford–Pettis, Pelczynski and Grothendieck
S. V. Kislyakov
1252
On cones of finite rank
M. A. Krasnosel'skii, A. V. Sobolev
1256
Characterization of Lorentz transformations
A. V. Kuz'minykh
1260
The inverse scattering problem for the nonselfadjoint Dirac operator on the whole axis
F. G. Maksudov, S. G. Veliev
1263
On the existence of bounded Galerkin nets for nonlinear operators
V. R. Portnov
1267
Fractional powers of coercively positive sums of operators
P. E. Sobolevskii
1271
On the homotopy classification of Douglis–Nirenberg elliptic systems
V. I. Shevchenko
1275
The Favard–Muhamadiev theory and pseudo-differential operators
M. A. Shubin
1278

FLUID MECHANICS
Experimental investigation of pulse characteristics of the turbulent pipe flow of conductive fluid in a longitudinal magnetic field
E. Yu. Krasil'nikov, V. G. Lushchik, V. S. Nikolaenko, I. G. Panevin, I. A. Platnieks, A. B. Tsinober
1281

ASTRONOMY
On the gas exchange between the Martian upper atmosphere and the solar wind
A. V. Bogdanov, O. L. Vaisberg, A. P. Kalinin, V. N. Smirnov
1284
Synthesis of Martian colour images according to photoevidences obtained aboard the “Mars-5” space vehicle
D. S. Lebedev, L. P. Yaroslavskii, M. K. Naraeva, A. S. Selivanov, I. S. Fainberg
1288
Astronomic factors of estimate shifts in the radar observations of meteor track drift
V. V. Fedynskii, B. L. Kashcheev, V. A. Nechitailenko
1292

MATHEMATICAL PHYSICS
Exact solutions of the Boltzmann equation
A. V. Bobylev
1296

PHYSICS
Gasdynamic processes in high-pressure, fast-flow $\mathrm{CO}_2$ laser operating under conditions of repeating pulses
S. A. Golubev, A. S. Kovalev, N. V. Mikhailova, E. E. Myshetskaya, I. G. Persiantsev, V. D. Pis'mennyi, A. T. Rakhimov, A. P. Favorski
1300

CRYSTALLOGRAPHY
More precise defined of structure of chkalovite, $\mathrm{Na}_2\mathrm{Be}[\mathrm{Si}_2\mathrm{O}_6]$
M. A. Simonov, Yu. K. Egorov-Tismenko, N. V. Belov
1319
 
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