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Published online by Cambridge University Press: 20 November 2018
Let dbe a positive square-free integer and let Od denote the ring of integers in . The groups PSL2(Od) are collectively known as the Bianchi groups and have been widely studied from the viewpoints of group theory, number theory and low-dimensional topology. The interest of the present article is in geometric Fuchsian subgroups of the groups PSL2(Od). Clearly PSL2
is such a subgroup; however results of [18], [19] show that the Bianchi groups are rich in Fuchsian subgroups.