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- [3] Ductile tantalum and columbium TRANSACTIONS OF THE AMERICAN INSTITUTE OF MINING AND METALLURGICAL ENGINEERS, 1938, 128 : 67 - 70
- [5] THE HALIDES OF NIOBIUM (COLUMBIUM) AND TANTALUM .3. THE VAPOUR PRESSURES OF NIOBIUM (COLUMBIUM) AND TANTALUM PENTAFLUORIDES JOURNAL OF THE CHEMICAL SOCIETY, 1951, (NOV): : 3051 - 3056
- [6] Extraction of tantalum and columbium from their ores TRANSACTIONS OF THE AMERICAN INSTITUTE OF MINING AND METALLURGICAL ENGINEERS, 1931, 96 : 147 - 162
- [8] The preparation and the properties of tantalum and columbium boride COMPTES RENDUS HEBDOMADAIRES DES SEANCES DE L ACADEMIE DES SCIENCES, 1929, 189 : 1279 - 1281
- [9] Determination of columbium and tantalum in stainless steel INDUSTRIAL AND ENGINEERING CHEMISTRY-ANALYTICAL EDITION, 1938, 10 : 0233 - 0235