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"Regular maps and principal congruence subgroups of Hecke groups."
Ioannis P. Ivrissimtzis, David Singerman (2005)
- Ioannis P. Ivrissimtzis
, David Singerman:
Regular maps and principal congruence subgroups of Hecke groups. Eur. J. Comb. 26(3-4): 437-456 (2005)

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