%0 Journal Article %A William C. Lyford %T Spectral Analysis of the Laplacian in Distorted Periodic Waveguides. %J Mathematische Annalen %D 1978 %P 255-284 %V 236 %I mathdoc %U http://geodesic.mathdoc.fr/item/MAN_1978__236_163175/ %F MAN_1978__236_163175