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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     author = {Benedetto, Dario and Caglioti, Emanuele and Libero, Roberto},
     title = {Non-trapping sets and {Huygens} principle},
     journal = {ESAIM: Mod\'elisation math\'ematique et analyse num\'erique},
     pages = {517--530},
     publisher = {EDP-Sciences},
     volume = {33},
     number = {3},
     year = {1999},
     mrnumber = {1713236},
     zbl = {0935.35167},
     language = {en},
     url = {http://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. http://www.numdam.org/item/M2AN_1999__33_3_517_0/

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