Cangül, İ. N. And Bizim, O. 2002. Congruence subgroups of some Hecke Groups. Bull of Academia Sinica , vol.30 , 115-131.

Cangül, İ. N., & Bizim, O., (2002). Congruence subgroups of some Hecke Groups. Bull of Academia Sinica , vol.30, 115-131.

Cangül, İSMAİL, And Osman Bizim. "Congruence subgroups of some Hecke Groups," Bull of Academia Sinica , vol.30, 115-131, 2002

Cangül, İSMAİL N. And Bizim, Osman. "Congruence subgroups of some Hecke Groups." Bull of Academia Sinica , vol.30, pp.115-131, 2002

Cangül, İ. N. And Bizim, O. (2002) . "Congruence subgroups of some Hecke Groups." Bull of Academia Sinica , vol.30, pp.115-131.

@article{article, author={İSMAİL NACİ CANGÜL And author={Osman Bizim}, title={Congruence subgroups of some Hecke Groups}, journal={Bull of Academia Sinica}, year=2002, pages={115-131} }