Geodesic
Scattering by a Cylindrical Trap in the Critical Case
Matematičeskie zametki, Tome 73 (2003) no. 3, pp. 355-370.

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We study a two-dimensional analog of the Helmholtz resonator with walls of finite thickness in the critical case, for which there exists a frequency which is simultaneously the limit of poles generated both by the bounded component of the resonator and by a narrow communication channel. Under the assumption that the limit frequency is a simple frequency for the bounded component, by using the method of matched asymptotic expansions, we construct asymptotics for the two sequences of poles converging to this frequency. We obtain explicit formulas for the leading terms of the asymptotics of poles and for the solution of the scattering problem. 
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R. R. Gadyl'shin. Scattering by a Cylindrical Trap in the Critical Case. Matematičeskie zametki, Tome 73 (2003) no. 3, pp. 355-370. http://geodesic.mathdoc.fr/item/MZM_2003_73_3_a3/

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