- Balkan Mts (Stara Planina)
| tin.er.usgs.gov (n.d.) http://tin.er.usgs.gov/sedznpb/show-sedznpb-xml.php?rec_id=67 ATANASSOVA, S. THE PRESERVED MINERAL DIVERSITY OF SEDMOCHISLENITSI DEPOSIT, VRATSA ORE REGION. Svetla Atanassova, The Preserved Mineral Diversity of Sedmochislenitsi Deposit, Vratsa Ore Region. pp 207-216 |