On the poles of the scattering matrix for two convex obstacles
Journées équations aux dérivées partielles, no. 1 (1985), article no. 5, 14 p. 
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Ikawa, Mitsuru. On the poles of the scattering matrix for two convex obstacles. Journées équations aux dérivées partielles, no. 1 (1985), article  no. 5, 14 p. http://archive.numdam.org/item/JEDP_1985___1_A5_0/

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