1. Elliptic operators, discrete groups and von Neumann algebras;Atiyah;Asterisque,1976
2. Ihara–Selberg zeta function of a tree lattice;Bass;Internat. J. Math.,1992
3. Uniform tree lattices;Bass;J. Amer. Math. Soc.,1990
4. L2-cohomology and group cohomology;Cheeger;Topology,1986
5. Von Neumann Algebras;Dixmier,1981