Abstract
We show that there are only finitely many maximal congruence subgroups of the Bianchi groups such that the quotient by \(\mathbb{H}^3\) has only one cusp.
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Petersen, K.L. One-cusped congruence subgroups of Bianchi groups. Math. Ann. 338, 249–282 (2007). https://doi.org/10.1007/s00208-006-0065-z
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DOI: https://doi.org/10.1007/s00208-006-0065-z