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Publikováno v:
Vietnam Journal of Mathematics. 45:241-253
We study the Helmholtz equation in a perforated domain Ω e . The domain Ω e is obtained from an open set $\phantom {\dot {i}\!}{\Omega }\subset \mathbb {R}^{3}$ by removing small obstacles of typical size e>0, the obstacles are located along a 2-di