TY  - JOUR
AU  - Waldemar Hebisch
TI  - Sharp pointwise estimate for the kernels of the semigroup generated by sums of even powers of vector fields on homogeneous groups
JO  - Studia Mathematica
PY  - 1989
SP  - 93
EP  - 106
VL  - 95
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/sm-95-1-93-106/
DO  - 10.4064/sm-95-1-93-106
LA  - en
ID  - 10_4064_sm_95_1_93_106
ER  -