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@article{MAN_1975__218_162797, author = {William C. Lyford}, title = {Spectral {Analysis} of the {Laplacian} in {Domains} with {Cylinders.}}, journal = {Mathematische Annalen}, pages = {229--252}, publisher = {mathdoc}, volume = {218}, year = {1975}, zbl = {0313.35060}, url = {http://geodesic.mathdoc.fr/item/MAN_1975__218_162797/} }
William C. Lyford. Spectral Analysis of the Laplacian in Domains with Cylinders.. Mathematische Annalen, Tome 218 (1975), pp. 229-252. http://geodesic.mathdoc.fr/item/MAN_1975__218_162797/