 His 2001 work "Şehir Lakapları" ("Titles and Epithets of Islamic Towns") represents a major contribution to the knowledge of the orthography and locations of Islamic mint towns.This work has become the standard reference on the subject.In 1993 at the suggestion of Cüneyt Ölçer, Diler began work on what would become a comprehensive book on the coinage of the Ilkhanate.