Information resources «Deсoratіvе Stone»
| O. Lysenko State Gemmological Centre of Ukraine |
| O. Manokhin State Gemmological Centre of Ukraine |
| L. Manokhina State Gemmological Centre of Ukraine |
| O. Maksiuta State Gemmological Centre of Ukraine |
| Language: Ukrainian |
| Precious and Decorative Stones. No. 1 (79), 2015: 24–26 |