Matthiesen, F.; Christensen, E.; von Barner, J. H.; Bjerrum, N. J. (1996). "The Redox Chemistry of Niobium(V) Fluoro and Oxofluoro Complexes in LiF-NaF-KF Melts". Journal of the Electrochemical Society. 143 (6): 1793–1799. Bibcode:1996JElS..143.1793M. doi:10.1149/1.1836906.
Brown, G. M.; Walker, L. A. (1966). "Refinement of the structure of potassium heptafluoroniobate, K2NBF7, from neutron-diffraction data". Acta Crystallographica. 20 (2): 220–229. Bibcode:1966AcCry..20..220B. doi:10.1107/s0365110x66000458.
Keller, O. L. (1963). "Identification of Complex Ions of Niobium(V) in Hydrofluoric Acid Solutions by Raman and Infrared Spectroscopy". Inorganic Chemistry. 2 (4): 783–787. doi:10.1021/ic50008a029.
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Matthiesen, F.; Christensen, E.; von Barner, J. H.; Bjerrum, N. J. (1996). "The Redox Chemistry of Niobium(V) Fluoro and Oxofluoro Complexes in LiF-NaF-KF Melts". Journal of the Electrochemical Society. 143 (6): 1793–1799. Bibcode:1996JElS..143.1793M. doi:10.1149/1.1836906.
Brown, G. M.; Walker, L. A. (1966). "Refinement of the structure of potassium heptafluoroniobate, K2NBF7, from neutron-diffraction data". Acta Crystallographica. 20 (2): 220–229. Bibcode:1966AcCry..20..220B. doi:10.1107/s0365110x66000458.