no. 4
Scattering phases and density of states for exterior domains
Annales de l'I.H.P. Physique théorique, Tome 62 (1995) no. 4, pp. 383-399. 
@article{AIHPA_1995__62_4_383_0,
     author = {Eckmann, J.-P. and Pillet, C.-A.},
     title = {Scattering phases and density of states for exterior domains},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {383--399},
     publisher = {Gauthier-Villars},
     volume = {62},
     number = {4},
     year = {1995},
     mrnumber = {1343783},
     zbl = {0834.35095},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1995__62_4_383_0/}
}
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Eckmann, J.-P.; Pillet, C.-A. Scattering phases and density of states for exterior domains. Annales de l'I.H.P. Physique théorique, Tome 62 (1995) no. 4, pp. 383-399. http://www.numdam.org/item/AIHPA_1995__62_4_383_0/

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