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Constantina, C.; Pop, D.: Brief overwiew on the SiO2 varieties of gem-quality from southern Apuseni mountains (Romania). Acta mineralogica-petrographica, (1). p. 21. (2003)
Pop, D.; Ureche, I.; Bedelean, H.: Roşiǎ Montană, Romania: : From museum Samples to the implications of a new "Gold Rush". Acta mineralogica-petrographica, (1). p. 86. (2003)