MathSciNet bibliographic data MR1056153 (91d:11035) 11E57 (19B10 20G35) Costa, Douglas; Keller, Gordon Normal subgroups of ${\rm SL}(2,A)$${\rm SL}(2,A)$. Bull. Amer. Math. Soc. (N.S.) 24 (1991), no. 1, 131–135. Article

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