Early chalcolithic in North-Central Anatolia : the evidence from Boğazköy-Büyükkaya = Kuzey-Orta Anadolu'da ilk kalkolitik Çağ : Boğazköy-Büyükkaya verileri - Schoop, Ulf-Dietrich (Tüba-ar, 8.2005, 2005)