TY  - JOUR
AU  - Jacek Dziubański
AU  - Andrzej Hulanicki
TI  - On semigroups generated by left-invariant positive differential operators on nilpotent Lie groups
JO  - Studia Mathematica
PY  - 1989
SP  - 81
EP  - 95
VL  - 94
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/sm-94-1-81-95/
DO  - 10.4064/sm-94-1-81-95
LA  - en
ID  - 10_4064_sm_94_1_81_95
ER  -