For citations:
Nikishina E.E., Drobot D.V., Lebedeva E.N. NIOBIUM AND TANTALUM: STATE OF THE WORLD MARKET, FIELD OF APPLICATION, RAW PRODUCT SOURCES. Part 2. Izvestiya. Non-Ferrous Metallurgy. 2014;(1):29-41. (In Russ.) https://doi.org/10.17073/0021-3438-2014-1-29-41