MathSciNet bibliographic data MR2016709 11F06 (11F12 11F22) Cummins, C. J.; Pauli, S. Congruence subgroups of ${\rm PSL}(2,{\Bbb Z})$${\rm PSL}(2,{\Bbb Z})$ of genus less than or equal to 24. Experiment. Math. 12 (2003), no. 2, 243–255. Article

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