Geodesic
Essential spectrum of the Laplacian for the Neumann problem in a model region of complicated structure
Teoretičeskaâ i matematičeskaâ fizika, Tome 99 (1994) no. 1, pp. 3-19 
A. A. Kiselev; B. S. Pavlov. Essential spectrum of the Laplacian for the Neumann problem in a model region of complicated structure. Teoretičeskaâ i matematičeskaâ fizika, Tome 99 (1994) no. 1, pp. 3-19. http://geodesic.mathdoc.fr/item/TMF_1994_99_1_a1/
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     title = {Essential spectrum of the {Laplacian} for the {Neumann} problem in a~model region of complicated structure},
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A class of regions in which the Laplacian for the Neumann problem has an essential spectrum is considered. The connection between the geometrical characteristics of the region and spectral properties of the Laplacian for the Neumann problem is studied in specific examples

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