Cangül, İ. N. 1994. Normal Subgroups of the Hecke Group H( ). Commun. Fac. Sci. Univ. Ank. Series A1 , vol.43 , 129-135.

Cangül, İ. N., (1994). Normal Subgroups of the Hecke Group H( ). Commun. Fac. Sci. Univ. Ank. Series A1 , vol.43, 129-135.

Cangül, İSMAİL. "Normal Subgroups of the Hecke Group H( )," Commun. Fac. Sci. Univ. Ank. Series A1 , vol.43, 129-135, 1994

Cangül, İSMAİL N. . "Normal Subgroups of the Hecke Group H( )." Commun. Fac. Sci. Univ. Ank. Series A1 , vol.43, pp.129-135, 1994

Cangül, İ. N. (1994) . "Normal Subgroups of the Hecke Group H( )." Commun. Fac. Sci. Univ. Ank. Series A1 , vol.43, pp.129-135.

@article{article, author={İSMAİL NACİ CANGÜL}, title={Normal Subgroups of the Hecke Group H( )}, journal={Commun. Fac. Sci. Univ. Ank. Series A1}, year=1994, pages={129-135} }