Geodesic
Numerical investigation of trapped modes in an irregular waveguide
Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 46 (2006) no. 3, pp. 501-508 Cet article a éte moissonné depuis la source Math-Net.Ru

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It is shown by means of a numerical experiment that an arbitrary asymmetric perturbation of the function describing a dielectric insert in a waveguide, in the general case, results in vanishing of the trapped mode; i.e., it ceases to exist. 
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A. V. Tikhonov. Numerical investigation of trapped modes in an irregular waveguide. Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 46 (2006) no. 3, pp. 501-508. http://geodesic.mathdoc.fr/item/ZVMMF_2006_46_3_a13/

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