R.I.335 T.Abboud H.Ammari P.Ferreira Analyse numerique de la diffraction d'ondes electromagnetiques par une structure periodique courbe. Cas de l'equation de Helmholtz The whole paper is available as a compressed Postscript file by internet procedure FTP anonymous on host barbes.polytechnique.fr ( 129.104.4.100) in the directory pub/RI/1996 under the name abboud_ammari_ferreira_335.jan.ps.gz or by Netscape or any other www client via the CMAP www server "http://www.cmap.polytechnique.fr/"