1. Homological dimension of discrete groups;Bieri;Queen Mary College Mathematics Notes,1976
2. Relative homology and Poincaré duality for group pairs;Bieri;J. Pure Appl. Algebra,1978
3. Groups of cohomological dimension one;Cohen,1972
4. Groups, trees and projective modules;Dicks,1980
5. Accessibility and groups of cohomological dimension one;Dunwoody;Proc. London Math. Soc.,1979