BookselmMonographpp. 65–66

Genus zero discrete groups Γ\Gamma such that Γ0(N)⊆Γ⊆Γ0(N)+\Gamma_0(N)\subseteq\Gamma\subseteq\Gamma_0(N)^+ (compiled by M.-L. Lang)

Genus zero discrete groups $\Gamma$ such that $\Gamma_0(N)\subseteq\Gamma\subseteq\Gamma_0(N)^+$ (compiled by M.-L. Lang) cover

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