MathSciNet bibliographic data MR1200251 (94a:20081) 20H10 (11F06) Akbas, M.; Singerman, D. The signature of the normalizer of \$\Gamma\sb 0(N)\$$\Gamma\sb 0(N)$. Groups, combinatorics & geometry (Durham, 1990), 77–86, London Math. Soc. Lecture Note Ser., 165, Cambridge Univ. Press, Cambridge, 1992. Article

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