Geodesic
On~non-almost-periodicity of solutions of the Sobolev problem in domains with edges
Izvestiya. Mathematics , Tome 45 (1995) no. 1, pp. 97-124.

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This paper is devoted to the study of spectral properties of the Sobolev problem on small oscillations of a rotating fluid in domains containing edges, and perhaps conical points. A new method is proposed for investigating “the Dirichlet problem” for a hyperbolic equation in domains with angles. The method is used to get concrete examples of three-dimensional domains for which there exist non-almost-periodic solutions of the Sobolev problem with a Dirichlet boundary condition, and to determine concrete intervals of the purely continuous spectrum of this problem. 
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S. D. Troitskaya. On~non-almost-periodicity of solutions of the Sobolev problem in domains with edges. Izvestiya. Mathematics , Tome 45 (1995) no. 1, pp. 97-124. http://geodesic.mathdoc.fr/item/IM2_1995_45_1_a4/

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