Send the following on WhatsApp
Continue to ChatUsage of Regular Map Theory in the Determination of Normal Subgroups of Some Triangle Groups - https://avesis.uludag.edu.tr/yayin/7ba6aa64-4a54-4649-a2c7-6383f0fa3bb1/usage-of-regular-map-theory-in-the-determination-of-normal-subgroups-of-some-triangle-groups