For citations:
Nikishina E.E., Drobot D.V., Lebedeva E.N. NIOBIOUM AND TANTALUM: STATE OF THE WORLD MARKET, FIELDS OF APPLICATION, RAW PRODUCTS SOURCES. PART 1. Izvestiya. Non-Ferrous Metallurgy. 2013;(5):28-34. (In Russ.) https://doi.org/10.17073/0021-3438-2013-5-28-34