Normal congruence subgroups of the Hecke groups \(G(2^{(1/2)})\) and \(G(3^{(1/2)})\) (Q1245991)

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scientific article; zbMATH DE number 3583903
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Normal congruence subgroups of the Hecke groups \(G(2^{(1/2)})\) and \(G(3^{(1/2)})\)
scientific article; zbMATH DE number 3583903

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    Normal congruence subgroups of the Hecke groups \(G(2^{(1/2)})\) and \(G(3^{(1/2)})\) (English)
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    1977
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