Poincar\'e Bisectors in Hyperbolic Spaces
  We determine explicit formulas for the bisectors used in constructing a Dirichlet fundamental domain in hyperbolic two and three space. They are compared with the isometric spheres employed in the construction of a Ford domain and used to find a finite set of generators for discrete groups of finite covolume. Applications are given to Fuchsian groups, Kleinian groups, including the Bianchi groups, and for the construction of a finite set of generators of the unit group of the integral group ring of a finite nilpotent group. An easy implementable algorithm, DAFC, is also given and used in the search for generators of discrete groups. 
Eric Jespers, Stanley Orlando Juriaans, Ann Kiefer, Antonio Calixto de   Souza Filho, Antonio De Andrade E Silva
math.GR math.NT math.RA