%0 Journal Article %A Günter Harder %T Interpolating coefficient systems and $p$-ordinary cohomology of arithmetic groups %J Groups, geometry, and dynamics %D 2011 %P 393-444 %V 5 %N 2 %U http://geodesic.mathdoc.fr/articles/10.4171/ggd/133/ %R 10.4171/ggd/133 %F 10_4171_ggd_133