1. M. J. Dunwoody, An equivariant sphere theorem, preprint.
2. A topological proof of the equivariant Dehn's lemma;Edmonds;Trans. Amer. Math. Soc.,1986
3. Projective planes in 3-manifolds;Epstein,1961
4. Least area incompressible surfaces in 3-manifolds;Freedman;Invent. Math.,1983
5. The Smith Conjecture;Gordon,1984