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5. N. V. Astakhova, O. N. Kolesnik, and V. T. Syedin, “Nonferrous, noble and rare-earth metals in ferromanganese crusts and basalts from the Belyaevsky Seamount (Sea of Japan),” Bull. Kamchat. Reg. Assoc. “Educat.-Sci. Center”, No. 2, 231–245 (2010).