Dirac Type Operators for Arithmetic Subgroups of Generalized Modular   Groups
  Fundamental solutions of Dirac type operators are introduced for a class of conformally flat manifolds. This class consists of manifolds obtained by factoring out the upper half-space of $\mathbb{R}^n$ by arithmetic subgroups of generalized modular groups. Basic properties of these fundamental solutions are presented together with associated Eisenstein and Poincar\'e type series. 
Elizabeth Bulla, Denis Constales, Rolf Soeren Krausshar, John Ryan