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Partially supported by NSF Grant 8922798-DMS
Partially supported by NSF Grant 9096158-DMS
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Donnelly, H., Garofalo, N. Riemannian manifolds whose Laplacians have purely continuous spectrum. Math. Ann. 293, 143–161 (1992). https://doi.org/10.1007/BF01444709
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DOI: https://doi.org/10.1007/BF01444709