Computational Complexity of Inner Products of Vectors (And That of Other Bilinear Forms) Over a Noncommutative Ring (Auxiliary Functions Allowed).

Robert Mandl Thomas Vari Computational Complexity of Inner Products of Vectors (And That of Other Bilinear Forms) Over a Noncommutative Ring (Auxiliary Functions Allowed). 49-55 1975 4 SIAM J. Comput. 1 db/journals/siamcomp/siamcomp4.html#MandlV75