%0 Journal Article
%A Sorin Popa
%T On a class of type $II_1$ factors with Betti numbers invariants
%J Annals of mathematics
%D 2006
%P 809-899
%V 163
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4007/annals.2006.163.809/
%R 10.4007/annals.2006.163.809
%G en
%F 10_4007_annals_2006_163_809