Authors: Özgür, Nihal Yilmaz

Citation: Özgür, Nihal Yilmaz, Principal Congruence Subgroups of Hecke Groups H(.q), Acta mathematica Sinica. English series (Print) , 22(2), 2006, pp. 383-392

Authors: Bulut, Serap Özgür, Nihal Yilmaz

Citation: Bulut, Serap et Özgür, Nihal Yilmaz, A New Characterization of Möbius Transformations by the Use of Apollonius Points of (2n . 1).gons, Acta mathematica Sinica. English series (Print) , 21(3), 2005, pp. 667-672