%0 Journal Article
%A Landsberg, J.
%T The border rank of the multiplication of 2×2 matrices is seven
%J Journal of the American Mathematical Society
%D 2006
%P 447-459
%V 19
%N 2
%U http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-05-00506-0/
%R 10.1090/S0894-0347-05-00506-0
%F 10_1090_S0894_0347_05_00506_0