Eisenstein series on three-dimensional hyperbolic space and imaginary quadratic number fields.
Vahlen's Group of Clifford Matrices and Spin-Groups.
Cohomology of S-arithmetic subgroups in the number field case.
Kloosterman sums for Clifford algebras and a lower bound for the positive eigenvalues of the Laplacian for congruence subgroups acting on hyperbolic spaces.
The Selberg zeta-function for cocompact discrete subgroups of PSL(2,C)
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