1. An elementary account of Selberg's lemma;Alperin;L'Enseignement Mathématique,1987
2. Cobordisme des difféomorphisms des surfaces;Bonahon;C.R.Acad.Sci.Paris,1980
3. The characteristic toric splitting of irreducible compact 3-orbifolds;Bonahon;Math. Ann.,1987
4. Finite group actions on homotopy 3-spheres;Davis,1984
5. Cyclic, normal subgroups of fundamental groups of 3-manifolds;Gordon;Topology,1975