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Kazakhstan | |
| Bespaev H.A., Uzhkenov B.S., Aliaskarov S.A., Egembaev K.M. (Almaty, 1999) Gemstones of Kazakhstan, Reference book. Volume 1. Deposits and occurrences of precious and semiprecious stones. |
| Bespaev H.A., Uzhkenov B.S., Aliaskarov S.A., Egembaev K.M. (Almaty, 1999) Gemstones of Kazakhstan, Reference book. Volume 1. Deposits and occurrences of precious and semiprecious stones. |
| Bespaev, Kh.A., Uzhkenov, B.S., Aliaksarov, S.A., and Egembaev, K.M. [Беспаев, Х.А., Ужкенов, Б.С., Алиаскаров, С.А., и Егембаев, К.М.] (2001) Gemstones of Kazakhstan. Reference book. Volume II. Semi-precious and ornamental stones [Самоцветы Казахстана. Справочник. Том II. Ювелирно-поделочные и поделочные самоцветы]. Information-Analytical Center for Geology and Mineral Resources of the Republic of Kazakhstan [Информационно-аналитический центр геологии и минеральных ресурсов Республики Казахстан], Almaty, pages 106-107 (in Russian). |
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Russia | |
| [var. Prase Opal] Mikhailov, B.M. (2000): Lithology and Mineral Resources 35(4), 351-364. |
| Mikhailov, B.M. (2000): Lithology and Mineral Resources 35(4), 351-364. |