See:
- http://muze.metu.edu.tr/index.php@option=com_content&task=view&id=13&Itemid=35
- http://tacdam.metu.edu.tr/ahlatlibel
- Laurens Thissen, New Insights in Balkan-Anatolian Connections in the Late Chalcolithic: Old Evidence from theTurkish Black Sea Littoral, British Institute at Ankara, Anatolian Studies,Vol. 43 (1993), pp. 207-237