Entire functions of exponential type, almost periodic in Besicovitch's sense on the real hyperplane

Abstract

Suppose that an almost periodic in Besicovitch's sense function $f(x)$ of several variables is the restriction to the real hyperplane of an entire function of exponential type $b$. Then its spectrum is contained in the ball of radius $b$ with the center in the origin.

9 pages, bibliography 9 items