Differ. Uravn., 1989, Volume 25, Number 4

JOURNALS // Differentsial'nye Uravneniya // Archive

1989, Volume 25, Number 4

Ordinary Differential Equations
	New frequency criteria for the absolute stability and instability of automatic control systems with nonstationary nonlinearity N. E. Barabanov	555
	Divergence of normalizing transformations in the case of real structurally unstable focus V. V. Basov	563
	A boundary value problem for fourth-order ordinary differential equations S. A. Bespalova, Yu. A. Klokov	573
	Estimates for the growth of solutions of differential equations K. Kh. Boimatov, P. I. Lizorkin	578
	Some uniqueness theorems in inverse problems of spectral analysis for Sturm–Liouville operators in the case of the Weyl limit circle M. G. Gasymov, G. Sh. Guseinov	588
	The central exponent of a linear system of differential equations O. G. Illarionova	599
	The problem of the stability of singular points on the plane from the point of view of algebraic and analytic solvability N. B. Medvedeva	605
	Oscillation and nonoscillation of solutions of first-order linear differential equations with deviating argument V. A. Nadareishvili	611
	Analytic solution of a linear functional-differential equation with linear deviation of the argument V. I. Rodionov	616
	Normal forms and regularization of nonlinear singularly perturbed evolution equations V. F. Safonov	627
	Classes of third-order systems with quadratic right-hand sides without moving critical points A. I. Yablonskii, A. F. Korzyuk	635

Partial Differential Equations
	Optimal control of linear loaded parabolic equations M. T. Dzhenaliev (Jenaliyev)	641
	Symmetrization of a hyperbolic equation S. E. Zhelezovsky, V. Ph. Kirichenko, V. A. Krys'ko	652
	Smoothness of parabolic Pagni potentials. II. Proof of theorems on smoothness of direct values of Pagni potentials L. I. Kamynin	659
	Self-oscillatory solutions of a class of singularly perturbed boundary value problems E. P. Kubishkin	674
	$K$-limits of solutions of second-order quasilinear elliptic equations B. P. Kufarev, N. G. Nikulina, B. V. Sokolov	686
	Estimates for the Green function and for solutions of the second mixed problem for a parabolic equation A. V. Lezhnev	692
	Solvability of a boundary value problem for hyperbolic equations in nonclassical domains M. E. Lerner	704
	Some expansions of arbitrary functions in integrals with respect to spherical functions A. I. Moshinskii	716

Short Communications
	Necessary conditions for the basis property in the direct sum of Sobolev spaces E. P. Bogomolova	722
	Estimates for solutions of quasilinear systems of parabolic type M. I. Gil'	723
	On a problem of Florio and Seibert B. S. Kalitin	727
	Fractional powers of quasidifferential operators and theorems on the property of being a basis T. B. Kasumov	729