- Balkan Mts (Stara Planina)
| www.geologija-revija.si (n.d.) http://www.geologija-revija.si/dokument.aspx?id=231 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 |