Aa. Bytsenko et al., DETERMINANT OF THE LAPLACIAN ON A NONCOMPACT 3-DIMENSIONAL HYPERBOLICMANIFOLD WITH FINITE-VOLUME, Journal of physics. A, mathematical and general, 30(10), 1997, pp. 3543-3552
The functional determinant of Laplace-type operators on a three-dimens
ional non-compact hyperbolic manifold with invariant fundamental domai
n of finite volume is expressed via the Selberg zeta function related
to the Picard group SL(2, Z + iZ)/{+/-Id}.