Geodesic
A class of topographical waveguides
Algebra i analiz, Tome 22 (2010) no. 1, pp. 98-107 Cet article a éte moissonné depuis la source Math-Net.Ru

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In the case of some infinite domains, it is shown that the spectrum of the elasticity theory operator is not purely continuous. This implies the existence of a new class of the so-called topographical waveguides. 
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V. M. Babich. A class of topographical waveguides. Algebra i analiz, Tome 22 (2010) no. 1, pp. 98-107. http://geodesic.mathdoc.fr/item/AA_2010_22_1_a4/

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