1. Agard, S.: A geometric proof of Mostow's rigidity theorem for groups of divergence type. Acta Math.151, 231?252 (1983)
2. Agard, S.: Elementary properties of Möbius transformations inR n with applications to rigidity theory. University of Minnesota, Math. Rep. (mimeographed notes) No. 82-100 (1982)
3. Agard, S.: Remarks on the boundary mapping for a Fuchsian group. (To appear)
4. Ahlfors, L.V.: Möbius transformations in several dimensions. Mimeographed lecture notes at the University of Minnesota 1981
5. Apanasov, B.N.: Geometrically finite groups of spatial transformations. Sib. Math. J. (Russian)23, (6) 16?27 (1982)