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- [5] ANOMALOUS SLIP IN HIGH-PURITY NIOBIUM AND TANTALUM SINGLE-CRYSTALS PHYSICA STATUS SOLIDI A-APPLIED RESEARCH, 1995, 147 (02): : 417 - 446
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- [7] Liquid-liquid extraction of niobium and tantalum with the production of high-purity pentoxides Tsvetnye Metally, 2002, (07): : 62 - 64
- [9] PREPARATION OF HIGH-PURITY NIOBIUM JOURNAL OF THE LESS-COMMON METALS, 1988, 139 (01): : 189 - 202