\bib{1973/hopcroft-duality}
\yr 1973
\mr 56:17201
\by John E. Hopcroft
\by J. Musinski
\paper Duality applied to the complexity of matrix multiplications and other bilinear forms
\jour SIAM Journal on Computing
\issn 0097--5397
\vol 2
\pages 159--173
\seeolder \cite{1973/hopcroft-duality-draft}
\endref