Journals / Turkish Journal of Mathematics / 2006 / Cilt: 30 - Sayı: 2On the power subgroups of the extended modular group $overline{Gamma}$Sebahattin İKİKARDEŞ, Recep ŞAHİN, Özden KORUOĞLUJournalTurkish Journal of MathematicsIssue2006 · Cilt: 30 - Sayı: 2Pages233–235DOI—