Includes bibliographical references.

On properties of sequences of linear aggregates that converge in a region in which the system of functions generating the linear aggregates is not complete /; Singular modular functions /; Weighted approximations by polynomials /; On Fourier-Stieltjes coefficients of singular functions /; Questions of the stability of solutions of a system of two linear differential equations of canonical form with periodic coefficients /; On the number of limit cycles of the equation frac {dy}{dx}= \frac {P(x, y)}{Q(x,y)'} where and are polynomials of the second degree /; Boundary value problems for partial differential equations and certain classes of operator equations /; On a class of linear integral equations /; On a class of integral equations /; Existence theorems for solutions of integro-differential equations /; Two-dimensional problems of the calculus of variations in nonparametric form, transformed into parametric form /; Completely continuous perturbations of operators /; Some problems of nonlinear analysis / A. F. Leontev; I. I. Pyateckii-Sapiro; S. N. Mergelyan; O. S. Ivasev-Musatov; V. A. Yakubovic; I. G. and Landis Petrovskii, E. M.; M. I. and Ladyzenskaya Visik, O. A.; I. A. Goldfain; Yu. I. Lyubic; B. M. Gagaev; A. G. Sigalov; Yu. L. Smulyan; M. A. Krasnoselskii