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Wohlfahrt, K. Über die spitzenbreiten von kongruenzuntergruppen der rationalen modulgruppe. Abh.Math.Semin.Univ.Hambg. 59, 89–92 (1989). https://doi.org/10.1007/BF02942319
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DOI: https://doi.org/10.1007/BF02942319