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- [1] EXTRACTION OF NIOBIUM, TANTALUM, AND SOME OTHER ELEMENTS BY TETRAPHENYLARSONIUM CHLORIDE JOURNAL OF ANALYTICAL CHEMISTRY OF THE USSR, 1976, 31 (03): : 412 - 414
- [3] SOLVENT EXTRACTION OF PROTACTINIUM NIOBIUM AND TANTALUM FROM CITRATE SOLUTIONS ENERGIA NUCLEARE, 1967, 14 (03): : 168 - &
- [4] THE CHEMISTRY OF PROTACTINIUM .5. A COMPARISON OF THE EXTRACTION OF PROTACTINIUM, NIOBIUM AND TANTALUM JOURNAL OF INORGANIC & NUCLEAR CHEMISTRY, 1959, 10 (3-4): : 289 - 305
- [8] SEPARATION OF PROTACTINIUM(V) FROM SILICON AND OTHER ELEMENTS BY EXTRACTION FROM HYDROFLUORIC ACIDS SOLUTIONS ZHURNAL ANALITICHESKOI KHIMII, 1970, 25 (05): : 924 - &
- [9] EXTRACTION SEPARATION OF NIOBIUM FROM TANTALUM AND OTHER ELEMENTS WITH HIGH-MOLECULAR AMINES IN A HYDROCHLORIC-ACID MEDIUM DOKLADI NA BOLGARSKATA AKADEMIYA NA NAUKITE, 1976, 29 (08): : 1153 - 1156