MathSciNet bibliographic data MR1712893 11F06 Lang, Mong-Lung; Tan, Ser-Peow Normalizers of the congruence subgroups of the Hecke group \$G\sb 5\$$G\sb 5$. II. Proc. Amer. Math. Soc. 128 (2000), no. 8, 2271–2280. Article

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