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Bulgaria | |
| Vassileva, R. D., Atanassova, R., & Bonev, I. K. (2009). A review of the morphological varieties of ore bodies in the Madan Pb-Zn deposits, Central Rhodopes, Bulgaria. Geochem Mineral Petrol, 47, 31-49. |
- Septemvri Mine (Deveti Septemvri Mine)
| [var. Manganese-bearing Hedenbergite] A. Piestrzynski (2001) Mineral Deposits at the Beginning of the 21st Century. pp 925-928 |
| Bonev, I. K., Vladykin, N. V., Vassileva, R. D., & Daieva, L. A. (2003) Rare-earth and some trace elements in the metasomatic skarn-ore bodies of the Madan Pb-Zn deposits, Bulgaria. Bulgarian Academy of Sciences 40:73-85 |