%0 Journal Article
%A Yuri Savchuk
%T $C^*$-algebra generated by four projections with sum equal to 2
%J Algebra and discrete mathematics
%D 2004
%P 126-134
%N 3
%U http://geodesic.mathdoc.fr/item/ADM_2004_3_a9/
%G en
%F ADM_2004_3_a9