%0 Journal Article %A Piotr Budzy/nski %A Jan Stochel %T Joint subnormality of $n$-tuples and $C_0$-semigroups of composition operators on $L^2$-spaces %J Studia Mathematica %D 2007 %P 167-184 %V 179 %N 2 %U http://geodesic.mathdoc.fr/articles/10.4064/sm179-2-4/ %R 10.4064/sm179-2-4 %G en %F 10_4064_sm179_2_4