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1968, Volume 183, Number 2  

MATHEMATICS
The minima of a normed function in imaginary quadratid fields
E. A. Anfert'eva, N. G. Chudakov 		255–256
The optimal summation of Fourier series with approximate coefficients
V. Ya. Arsenin 		257–260
A certain boundary value problem for an equation of mixed parabolic-hyperbolic type
Kh. G. Bzhikhatlov, A. M. Nakhushev 		261–264
The construction of regular direction functions
N. A. Bobylev 		265–266
Structure of the set of solutions of dissipative equations
V. M. Gershtein, M. A. Krasnosel'skii 		267–269
Asymptotics of the solution of a boundary value problem for the biharmonic equation
M. G. Dzhavadov 		270–273
On the group classification of second order differential equations
N. H. Ibragimov 		274–277
A fixed point theorem for generalized condensing operators
E. A. Livshitz, B. N. Sadovskii 		278–279
A certain nonlinear system of equations of mixed type
I. V. Maiorov 		280–283
A certain boundary value problem for the Navier-Stokes system of equations
V. P. Mikhailov 		284–287
An analog of Plancherel's formula for hyperboloids
V. F. Molchanov 		288–291
Differential equations with unbounded operators which generate nonanalytic semigroups
P. E. Sobolevskii 		292–295
Boundary value problems of Sobolev type for elliptic operators
B. Sternin 		296–299

CYBERNETICS AND THE REGULATION THEORY
On the theory of necessary optimality conditions governing special controls
R. Gabasov 		300–302
Adaptive systems with multistep goal conditions
V. A. Yakubovich 		303–306

HYDRAULICS
Equations and boundary-value problems in the theory of two-phase filtration flow in a porous medium
V. L. Danilov, A. N. Konovalov, S. I. Yakuba 		307–310

PHYSICS
Jumping transfer in not ordered lattice
M. I. Klinger 		311–314
Townsend's ionization coefficient of $\mathrm{He}$ with allowance for indirect ionization
E. D. Lozanskiy 		315–318
Quasi stationary states in a conical potential well
E. E. Nikitin 		319–322

GEOPHYSICS
A solution of the nonlinear nonstationary problem for the planetary-scale atmospheric motion
E. N. Blinova 		323–325
A second experiment in the direct study of the ionosphere for ion-molecular reaction constants
A. D. Danilov, V. K. Semenov 		326–328
The use of transverse waves in studying the earth crust
N. I. Khalevin, È. A. Nezolenova, V. S. Lomakin 		329–331

CRYSTALLOGRAPHY
Conditions of formation of rhombohedral $(3R)$ molybdenite
R. W. Boyle 		332–333
 
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