1. Buildings: Theory and Applications, vol. 248;Abramenko,2008
2. Covering theory for graphs of groups;Bass;J. Pure Appl. Algebra,1993
3. Combinatorics of Coxeter Groups, vol. 231;Bjorner,2006
4. Metric Spaces of Non-positive Curvature;Bridson,1999
5. Tree Lattices;Bass,2001