%0 Journal Article %A Mikhail Lifshits %A Werner Linde %T Compactness properties of weighted summation operators on trees—the critical case %J Studia Mathematica %D 2011 %P 75-96 %V 206 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm206-1-6/ %R 10.4064/sm206-1-6 %G en %F 10_4064_sm206_1_6