Não informado. (2001). Annual report on the mineral resources of the URSS. Geological Committee.
Chicago-viite (17. p.)Não informado. Annual Report on the Mineral Resources of the URSS. Leningrad, Rússia: Geological Committee, 2001.
MLA-viite (8. p.)Não informado. Annual Report on the Mineral Resources of the URSS. Geological Committee, 2001.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.