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