%0 Journal Article %A Jacek DziubaƄski %T Note on semigroups generated by positive Rockland operators on graded homogeneous groups %J Studia Mathematica %D 1994 %P 115-126 %V 110 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-110-2-115-126/ %R 10.4064/sm-110-2-115-126 %G en %F 10_4064_sm_110_2_115_126