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1999, Volume 35, Number 12  

Ordinary Differential Equations
On the generation of limit cycles from a separatrix contour in a three-parameter family of dynamical systems on orientable two-dimensional manifolds
A. N. Deryugin, A. Yu. Loskutov 		1587–1596
Equiconvergence of biorthogonal expansions in root functions of differential operators. I
V. M. Kurbanov 		1597–1609
Controllability of linear discrete systems in a Banach space. II
S. A. Minyuk 		1610–1618
On the connectedness of values of a solution of a differential equation with multidimensional time without the complete integrability assumption
A. D. Myshkis 		1619–1623
Trajectories on a sphere that are generated by Lagrangians with higher-order derivatives
Yu. N. Orlov, V. M. Suslin 		1624–1629
The rotation method and singular numbers of three-dimensional systems
I. N. Sergeev 		1630–1639

Partial Differential Equations
The wave equation with a boundary control at one end and the other end fixed
V. A. Il'in 		1640–1659
Multiparametric solutions of the Tzitzeica equation
O. V. Kaptsov, Yu. V. Shan'ko 		1660–1668
The Fourier method in the Cauchy problem and absolutely representing systems of exponentials. I
Yu. F. Korobeinik 		1669–1676
A boundary value problem of the first kind for some nonlinear differential equations with degeneration on manifolds of arbitrary dimensions
Yu. D. Salmanov 		1677–1683
$R$-identity of second-order elliptic operators with continuous coefficients
M. R. Faradzheva 		1684–1690
On the existence and stability of periodic solutions of an inhomogeneous hyperbolic equation
M. Haydukevich, V. A. Chernyatin 		1691–1700
On some properties of the parabolic potential of bulk masses. I
M. F. Cherepova 		1701–1706

Short Communications
Investigation of the stability of solutions of nonlinear systems with unbounded perturbations
A. V. Platonov 		1707–1708
A mixture of the Leray–Schauder and the Poincaré–Andronov methods in the problem of periodic solutions of ordinary differential equations
V. V. Filippov 		1709–1711
The method of small regular perturbations in the investigation of singular differential equations in a Banach space
V. I. Fomin 		1712

Letter to the editor
Letter to the editors: “The trace of the Laplace-Beltrami operator with a potential on a Zoll surface” [Differ. Uravn. 35 (1999), no. 4, 528–539, 575; MR1719784]
A. N. Bobrov 		1713
 
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