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- [6] TECHNICAL, ECONOMIC AND OTHER FACTORS IN THE GRAVITY CONCENTRATION OF TIN, TUNGSTEN, COLUMBIUM, AND TANTALUM ORES MINERALS SCIENCE AND ENGINEERING, 1979, 11 (02): : 99 - 121
- [8] Ductile tantalum and columbium TRANSACTIONS OF THE AMERICAN INSTITUTE OF MINING AND METALLURGICAL ENGINEERS, 1938, 128 : 67 - 70
- [10] Recent developments in tantalum and columbium INDUSTRIAL AND ENGINEERING CHEMISTRY, 1938, 30 : 251 - 254