"Published by the American Mathematical Society ... under a grant from the National Science Foundation"--Title page.

On the asymptotic behavior of the spectral function and expansion in eigenfunctions of the equation Delta u+\{\lambda -q(x_1,x_2,x_3)\}u=0 /; Spectral analysis of non-selfadjoint operators /; The method of finite differences in the theory of partial differential equations /; A priori estimates in _p and generalized solutions of elliptic equations and systems /; Some questions in the qualitative theory of elliptic and parabolic equations /; Regular degeneration and boundary layer for linear differential equations with small parameter / B. M. Levitan; M. A. Naimark; O. A. Ladyzenskaya; A. I. Koselev; E. M. Landis; M. I. Visik and L. A. Lyusternik