TY  - JOUR
AU  - Sorin Popa
TI  - On a class of type $II_1$ factors with Betti numbers invariants
JO  - Annals of mathematics
PY  - 2006
SP  - 809
EP  - 899
VL  - 163
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4007/annals.2006.163.809/
DO  - 10.4007/annals.2006.163.809
LA  - en
ID  - 10_4007_annals_2006_163_809
ER  -