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4. Boyarko, G.Yu. and Khat’kov, V.Yu., Commodity flows of ferroalloys in Russia, Chern. Met., 2018, no. 3, pp. 60–69.
5. The Governmental report “On the state and use of mineral resources of the Russian Federation in 2015,” in Margantsevye rudy (Manganese Ore), Moscow: Vseross. Nauchno-Issled. Inst. Miner. Syr’ya, 2016, pp. 101–108.