Principal Congruence Subgroups of the Hecke Groups
2009 ◽
Vol 40
(4)
◽
pp. 479-494
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2005 ◽
Vol 26
(3-4)
◽
pp. 437-456
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2005 ◽
Vol 22
(2)
◽
pp. 383-392
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2018 ◽
Vol 19
(2)
◽
pp. 307-350
Keyword(s):
1994 ◽
Vol 122
(2)
◽
pp. 355
◽
1999 ◽
Vol 51
(2)
◽
pp. 266-293
◽
Keyword(s):