MathSciNet bibliographic data MR2334495 (2008e:81053) 81R05 (15A30) Ohno, Hiromichi; Petz, Dénes; Szántó, András Quasi-orthogonal subalgebras of $4\times4$$4\times4$ matrices. Linear Algebra Appl. 425 (2007), no. 1, 109–118. Article

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