TY  - JOUR
AU  - Landsberg, J.
TI  - The border rank of the multiplication of 2×2 matrices is seven
JO  - Journal of the American Mathematical Society
PY  - 2006
SP  - 447
EP  - 459
VL  - 19
IS  - 2
UR  - http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-05-00506-0/
DO  - 10.1090/S0894-0347-05-00506-0
ID  - 10_1090_S0894_0347_05_00506_0
ER  -