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This research sponsored by the Office of Naval Research and the Sonderforschungsbereich at the University of Bonn.
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Lyford, W.C. Spectral analysis of the Laplacian in domains with cylinders. Math. Ann. 218, 229–251 (1975). https://doi.org/10.1007/BF01349697
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DOI: https://doi.org/10.1007/BF01349697