%0 Journal Article %A Bernard Host %T Ergodic seminorms for commuting transformations and applications %J Studia Mathematica %D 2009 %P 31-49 %V 195 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4064/sm195-1-3/ %R 10.4064/sm195-1-3 %G en %F 10_4064_sm195_1_3