TY  - JOUR
AU  - Robert J. Zimmer
TI  - Unitary spectum and the fundamental group for actions of semisimple Lie groups.
JO  - Mathematische Annalen
PY  - 1990
SP  - 697
EP  - 702
VL  - 287
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MAN_1990__287_1_164715/
ID  - MAN_1990__287_1_164715
ER  -