MathSciNet bibliographic data MR801319 (87a:16029) 16A38 (16A60) Formanek, Edward; Schofield, A. H. Groups acting on the ring of two $2\times 2$$2\times 2$ generic matrices and a coproduct decomposition of its trace ring. Proc. Amer. Math. Soc. 95 (1985), no. 2, 179–183. Article

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