Border Rank of a pxqx2 Tensor and the Optimal Approximation od a Pair of Bilinear Forms.

Dario Bini Border Rank of a pxqx2 Tensor and the Optimal Approximation od a Pair of Bilinear Forms. 98-108 1980 conf/icalp/1980 ICALP db/conf/icalp/icalp80.html#Bini80 http://dx.doi.org/10.1007/3-540-10003-2_63