1. G. Talmatchi, Pre-monetary signs from West-North-West areas of the Black Sea, Mega Publishing House, Cluj-Napoca, Romania, 2010 (in Romanian).
2. Studies on archaeological gold items found in Romanian territory using X-Ray-based analytical spectrometry
3. The Guelph PIXE software package
4. S. Ia. Olgovski, Metallic alloy of coins from lower Bug river - in “Olbia I eio okruga”, Kiev, Naukova, 1986.
5. J. Curtis, M. Kruszynski, Ancient Caucasian and Related Material in The British Museum, O P No 121, 2002.