International Symposium "Amber. Science and Art"
| O. Belichenko State Gemmological Centre of Ukraine |
| Language: Ukrainian |
| Precious and Decorative Stones. No. 1–2 (91–92), 2018: 33–34 |
| O. Belichenko State Gemmological Centre of Ukraine |
| Language: Ukrainian |
| Precious and Decorative Stones. No. 1–2 (91–92), 2018: 33–34 |