Não informado. (2001). Annual report on the mineral resources of the URSS. Geological Committee.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Annual Report on the Mineral Resources of the URSS. Leningrad, Rússia: Geological Committee, 2001.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Annual Report on the Mineral Resources of the URSS. Geological Committee, 2001.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.