MathSciNet bibliographic data MR908441 (89b:20101) 20H05 (20E15 20H25) Mason, A. W. Standard subgroups of ${\rm GL}\sb 2(A)$${\rm GL}\sb 2(A)$. Proc. Edinburgh Math. Soc. (2) 30 (1987), no. 3, 341–349. Article

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