| Czech Republic | |
- Moravia (Mähren; Maehren)
| Dana RICHTEROVÁ, Antonín PŘICHYSTAL and Zdeněk LOSOS, "Moravian Jurassic Geodes and their Geological Significance," GeoLines 13, 2001, p. 106. (http://geolines.gli.cas.cz/fileadmin/volumes/volume13/G13-106.pdf) | | Germany | | |
| Lapis 33 (10), 38-40. | | Kazakhstan | |
- Karagandy Province (Qaragandy Oblysy; Karaganda Oblast')
| Gems of Kazakhstan, - textbook, Almaty, 1999, v.1, pp. 71-73 (in Rus.) | | Slovakia | | |
| Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590 | | Uzbekistan | | |
| Pechenkin, V.G., and Pechenkin, I.G. (2005): Lithology and Mineral Resources 40(5), 462-471. |
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