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- [5] SEPARATION OF TITANIUM, TUNGSTEN, MOLYBDENUM, AND NIOBIUM BY ANION EXCHANGE JOURNAL OF RESEARCH OF THE NATIONAL BUREAU OF STANDARDS, 1954, 53 (04): : 261 - 262
- [6] CHROMATOGRAPHIC SEPARATION OF NIOBIUM, MOLYBDENUM, AND TUNGSTEN ON ALUMINUM OXIDE INDUSTRIAL LABORATORY, 1970, 36 (12): : 1824 - &
- [9] SEPARATION OF ZIRCONIUM AND HAFNIUM BY PARTITION PAPER-CHROMATOGRAPHY JOURNAL OF ANALYTICAL CHEMISTRY OF THE USSR, 1981, 36 (09): : 1224 - 1226