JournalsggdVol. 2, No. 4Groups, Geometry, and DynamicsVolume 2, No. 4 (2008) pp. 481–498Finiteness of arithmetic hyperbolic reflection groupsIan AgolMikhail BelolipetskyPeter StormKevin Whytepp. 499–593Entropy and isoperimetry for linear and non-linear group actionsMisha Gromovpp. 595–617Uniform non-amenability, cost, and the first ℓ<sup>2</sup>-Betti numberRussell LyonsMikaël PichotStéphane Vassout
pp. 481–498Finiteness of arithmetic hyperbolic reflection groupsIan AgolMikhail BelolipetskyPeter StormKevin Whyte
pp. 595–617Uniform non-amenability, cost, and the first ℓ<sup>2</sup>-Betti numberRussell LyonsMikaël PichotStéphane Vassout