%0 Journal Article
%A S. Popa
%T Classification of subfactors: the reduction to commuting squares.
%J Inventiones mathematicae
%D 1990
%P 19-44
%V 101
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM_1990__101_2_143795/
%F IM_1990__101_2_143795