11 Number theory
11Fxx Discontinuous groups and automorphic forms
11F06 Structure of modular groups and generalizations; arithmetic groups (2 articles)
-
Sahin, R.; Bizim, O.; Cangul, I. N.:
Commutator subgroups of the extended Hecke groups $\bar{H}(\lambda_q)$.
(English).
Czechoslovak Mathematical Journal,
vol. 54
(2004),
issue 1,
pp. 253-259
-
Tekcan, Ahmet; Bizim, Osman:
The connection between quadratic forms and the extended modular group.
(English).
Mathematica Bohemica,
vol. 128
(2003),
issue 3,
pp. 225-236