Bulletin of the Institute of
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A class of congruence subgroups of Hecke group $H( \lambda_{5}) $

Author： Musa Demirci, İsmail Naci Cangül

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A constructive method for the cycloidal normal free subgroups of finite index of Hecke groups $H(\sqrt{2})$ and $H(\sqrt{3})$

Author： Setenay Doğan, Musa Demirci, Osman Bizim, İsmail Naci Cangül

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Commutator subgroups of Hecke groups

Author： ISMAIL NACI CANGUL AND OSMAN BIZIM

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Congruence subgroups of some Hecke groups

Author： ISMAIL NACI CANGUL and OSMAN BIZIM

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