TY  - JOUR
AU  - Waldemar Hebisch
TI  - On operators satisfying the Rockland condition
JO  - Studia Mathematica
PY  - 1998
SP  - 63
EP  - 71
VL  - 131
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/sm-131-1-63-71/
DO  - 10.4064/sm-131-1-63-71
LA  - en
ID  - 10_4064_sm_131_1_63_71
ER  -