TY  - JOUR
AU  - E.M. Stein
TI  - An Example on the Heisenberg Group Related to the Levy Operator.
JO  - Inventiones mathematicae
PY  - 1982
SP  - 209
EP  - 216
VL  - 69
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM_1982__69_142948/
ID  - IM_1982__69_142948
ER  -