%0 Journal Article %A Jacek DziubaƄski %T On semigroups generated by subelliptic operators on homogeneous groups %J Colloquium Mathematicum %D 1993 %P 215-231 %V 64 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-64-2-215-231/ %R 10.4064/cm-64-2-215-231 %G en %F 10_4064_cm_64_2_215_231