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Jena, P. K.; Brocchi, E. A.; Garcia, R. I. (1997). "Kinetics of chlorination of niobium pentoxide by carbon tetrachloride". Metallurgical and Materials Transactions B28 (1): 39–45. doi:10.1007/s11663-997-0125-0. Bibcode: 1997MMTB...28...39J..