MathSciNet bibliographic data MR617080 10D07 (20H05) Grunewald, Fritz J.; Schwermer, Joachim Free nonabelian quotients of ${\rm SL}\sb{2}$${\rm SL}\sb{2}$ over orders of imaginary quadratic numberfields. J. Algebra 69 (1981), no. 2, 298–304. Article

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