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| [var. Chalcedony] Ciobanu, C. L. (2005): Kostovite and its argentian varieties: Deposits and mineral associations. Bulgarian Academy of Sciences, Geochemistry, Mineralogy and Petrology. 42, 1-22
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link.springer-ny.com (n.d.) http://link.springer-ny.com/link/service/journals/00126/contents/02/00273/s00126-002-0273-8ch002.html
Bonev, I.K.
Petrunov, R.
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