%0 Journal Article %A Joachim Schwermer %T Geometric cycles, Albert algebras and related cohomology classes for arithmetic groups %J Groups, geometry, and dynamics %D 2011 %P 529-552 %V 5 %N 2 %U http://geodesic.mathdoc.fr/articles/10.4171/ggd/138/ %R 10.4171/ggd/138 %F 10_4171_ggd_138