article_paleo_0153-9345_2000_num_26_2_4714
Rodopi Mountain Between Thrace and Aegea Region...Early Iron Age
A History of Metallurgy, Second Edition - 1992 - R.F. Tylecote - Maney Publishing for the Institute of Materials
Newly Discovered Chalcolithic Necropolis Near Kosharna Tell the Lower Danube in Prehistory 2011 Alexandria