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Stefanos Karampelas L. K. D. B. P. V., .Gems and Gemmology. : Springer.
Stefanos Karampelas Lore Kiefert Danilo Bersani Peter Vandenabeele, .Gems and Gemmology. : Springer.
Stefanos Karampelas Lore Kiefert Danilo Bersani Peter Vandenabeele, .: Springer. .