@article{AIHPA_1994__61_3_293_0,
     author = {Ducomet, B.},
     title = {Analytic properties of the resolvent for the {Helmholtz} operator outside a periodic surface},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {293--314},
     publisher = {Gauthier-Villars},
     volume = {61},
     number = {3},
     year = {1994},
     mrnumber = {1311069},
     zbl = {0811.35020},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1994__61_3_293_0/}
}