no. 3
Non-trapping sets and Huygens principle
ESAIM: Modélisation mathématique et analyse numérique, Tome 33 (1999) no. 3, pp. 517-530 
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     title = {Non-trapping sets and {Huygens} principle},
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     pages = {517--530},
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     url = {https://www.numdam.org/item/M2AN_1999__33_3_517_0/}
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Benedetto, Dario; Caglioti, Emanuele; Libero, Roberto. Non-trapping sets and Huygens principle. ESAIM: Modélisation mathématique et analyse numérique, Tome 33 (1999) no. 3, pp. 517-530. https://www.numdam.org/item/M2AN_1999__33_3_517_0/

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