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Sunada, T. (1988). Fundamental groups and Laplacians. In: Sunada, T. (eds) Geometry and Analysis on Manifolds. Lecture Notes in Mathematics, vol 1339. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0083059
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DOI: https://doi.org/10.1007/BFb0083059
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