MathSciNet bibliographic data MR1738680 (2000j:20093) 20H05 (11E57 20G30) Grunewald, Fritz; Schwermer, Joachim On the concept of level for subgroups of ${\rm SL}\sb 2$${\rm SL}\sb 2$ over arithmetic rings. Israel J. Math. 114 (1999), 205–220. Article

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