On semigroups generated by subelliptic operators on homogeneous groups

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1. Pascal Auscher, A. ter Elst, Derek Robinson, On positive Rockland operators
2. Jacek Dziubański, Jacek Zienkiewicz, Smoothness of densities of semigroups of measures on homogeneous groups
3. Jacek Dziubański, Waldemar Hebisch, Jacek Zienkiewicz, Note on semigroups generated by positive Rockland operators on graded homogeneous groups