MathSciNet bibliographic data MR409363 (53 #13118) 10D05 (20H10) Parson, L. Alayne Dedekind sums and noncongruence subgroups of the Hecke groups $G(\sqrt{2})$$G(\sqrt{2})$ and $G(\sqrt{3})$$G(\sqrt{3})$. Proc. Amer. Math. Soc. 57 (1976), no. 2, 194–196. Article

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