MathSciNet bibliographic data MR1400424 (98b:11041) 11F06 Conway, J. H. Understanding groups like \$\Gamma\sb 0(N)\$$\Gamma\sb 0(N)$. Groups, difference sets, and the Monster (Columbus, OH, 1993), 327–343, Ohio State Univ. Math. Res. Inst. Publ., 4, de Gruyter, Berlin, 1996. Links to the journal or article are not yet available

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