Differentsial'nye Uravneniya
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1969, Volume 5, Number 5  

A linear optimal control problem
V. G. Boltyanskii 		783–799
A necessary and sufficient criterion, and the precise asymptotics of stability in the first approximation
R. È. Vinograd 		800–813
The existence of a family of periodic solutions of a system of two second order differential equations
I. A. Pasynkova 		814–823
On the question of the stability of quasiperiodic motions
A. S. Gurtovnik, Yu. I. Neimark 		824–832
A generalization of Ljapunov's first theorem on stability to certain classes of differential equations in a Banach space
E. N. Gersht 		833–847
The stability of the state of equilibrium of systems of differential equations
M. M. Khapaev 		848–855
On the question of stability under constantly acting perturbations
N. G. Bulgakov 		856–861
Integral equations with a discontinuous operator
N. V. Azbelev, R. K. Ragimkhanov, L. N. Fadeeva 		862–873
The behavior of the integral surfaces of a homogeneous Pfaffian differential equation in the vicinity of singular rays
M. V. Kozhero 		874–879
The existence and uniqueness of the solutions of differential equations with a retardation which depends on the solution and its derivative
L. A. Zhivotovskii 		880–889
A certain problem with a small parameter
M. S. Nikol'skii 		890–897
A partially characteristic mixed problem with Goursat initial conditions for linear equations with two-dimensional time
N. J. Yurchuk 		898–910
Estimates of the $L_p$ norms of derivatives by a nonregular set of differential operators
G. G. Kazaryan 		911–921
Some model equation systems of gas dynamics
Ya. I. Kanel' 		922–934
Certain plane problems of electrostatics which are connected with the conformal mapping of circular quadrangles
È. D. Pergamentseva 		935–944
The interdependence of harmonic functions of different dimensionality
Yu. A. Dement'ev 		945–951

Short Communications
Necessary optimality conditions for a system of integral equations
R. Gabasov 		952–953
Certain criteria for the stability of the transformation of a locally integrable signal by a transmission system
S. T. Zavalishchin 		954–957
On a variant of the averaging method for systems of integro-differential equations
A. N. Filatov, L. I. Talipova 		958–961
A solution of a certain problem in control theory
N. N. Petrov 		962–963
Isochronism in the case of a focus
V. I. Chemodanov 		964–966
Asymptotic formulae for the eigenvalues and eigenfunctions of a Sturm–Liouville type problem
S. S. Krickaya 		967–970
 
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