Não informado. (2001). Annual report on the mineral resources of the URSS. Geological Committee.
Chicago-referens (17:e uppl.)Não informado. Annual Report on the Mineral Resources of the URSS. Leningrad, Rússia: Geological Committee, 2001.
MLA-referens (8:e uppl.)Não informado. Annual Report on the Mineral Resources of the URSS. Geological Committee, 2001.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.