Ts.N. Abesadze, R.A. Bakhtadze, T.A. Dvali, O.M. Japaridze, On the History of Copper and Bronze Metallurgy in Georgia, Tbilisi, 1958, etc.
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(a) S. Piggott, Ancient Europe, Edinburgh, 1965. P. 74; (b) F. Hančar, “Die Nadelformen des Prähistorischen Kaukasusgebietes”, ESA 7. 1932. P. 113–182.