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The authors thank the Max-Planck-Institute for Mathematies in Bonn for its support.
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Elstrodt, J., Grunewald, F. & Mennicke, J. Kloosterman sums for Clifford algebras and a lower bound for the positive eigenvalues of the Laplacian for congruence subgroups acting on hyperbolic spaces. Invent Math 101, 641–685 (1990). https://doi.org/10.1007/BF01231519
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DOI: https://doi.org/10.1007/BF01231519