@article{AIHPA_1990__53_4_445_0,
     author = {Cardoso, Fernando and Petkov, Vesselin and Stoyanov, Luchezar},
     title = {Singularities of the scattering kernel for generic obstacles},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {445--466},
     publisher = {Gauthier-Villars},
     volume = {53},
     number = {4},
     year = {1990},
     mrnumber = {1096103},
     zbl = {0729.35099},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPA_1990__53_4_445_0/}
}