Geodesic
Scattering of a~scalar time-harmonic wave by~$N$ small spheres by the method of matched asymptotic expansions
Sibirskij žurnal vyčislitelʹnoj matematiki, Tome 15 (2012) no. 2, pp. 141-149.

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In this paper, we construct an asymptotic expansion of a time-harmonic wave scattered by $N$ small spheres. This construction is based on the method of matched asymptotic expansions. Error estimates give a theoretical background to the approach. 
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A. Bendali; P.-H. Cocquet; S. Tordeux. Scattering of a~scalar time-harmonic wave by~$N$ small spheres by the method of matched asymptotic expansions. Sibirskij žurnal vyčislitelʹnoj matematiki, Tome 15 (2012) no. 2, pp. 141-149. http://geodesic.mathdoc.fr/item/SJVM_2012_15_2_a2/

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