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In this article we corrected the trilinear formula for triple disjoint matrixmultiplication given in the article 'J. Laderman, V. Pan, X. H. Sha, Onpractical Algorithms for Accelerated Matrix Multiplication, Linear Algebra andits Applications. Vol. 162-164 (1992) pp. 557-588', which is incorrect formatrix dimensions equal to two or greater. That formula is a base of twoalgorithms, for disjoint and single matrix multiplication. The necessarycorrection made the amount of non scalar products raise, slightly increasingthe algorithm time complexity. We also corrected explicit formulas, in thebilinear form, for triple disjoint matrix multiplication. They are explicit,thus convenient for practical use of fast matrix multiplication algorithms inquestion.

Correction of 'J. Laderman, V. Pan, X. H. Sha, On practical Algorithms  for Accelerated Matrix Multiplication, Linear Algebra and its Applications.  Vol. 162-164 (1992) pp. 557-588'