no. 1
Erratum : “Analytic properties of the resolvent for the Helmholtz operator oustide a periodic surface”
Annales de l'I.H.P. Physique théorique, Tome 63 (1995) no. 1, p. 121. 
@article{AIHPA_1995__63_1_121_0,
     author = {Ducomet, B.},
     title = {Erratum : {{\textquotedblleft}Analytic} properties of the resolvent for the {Helmholtz} operator oustide a periodic surface{\textquotedblright}},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {121--121},
     publisher = {Gauthier-Villars},
     volume = {63},
     number = {1},
     year = {1995},
     zbl = {0836.35039},
     mrnumber = {1354443},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1995__63_1_121_0/}
}
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Ducomet, B. Erratum : “Analytic properties of the resolvent for the Helmholtz operator oustide a periodic surface”. Annales de l'I.H.P. Physique théorique, Tome 63 (1995) no. 1, p. 121. http://www.numdam.org/item/AIHPA_1995__63_1_121_0/