What is the fine-grained topic of the following text: « Iranian as Buffer Zone between the Universal Typologies of Turkic and Semitic », in : Éva Ágnes Csató ; Bo Isaksson and Carina Jahani, eds., Linguistic Convergence and Areal Diffusion: Case Studies from Iranian, Semitic and Turkic. Only return the topic.
The use of Iranian as a Buffer Zone in the linguistic convergence and areal diffusion between Turkic and Semitic typologies.