Beresneva, T. I.; Gosteva, G. P.; Ketov, A. N.
Zhurnal Neorganicheskoi Khimii, 1970 , vol. 15, p. 1706 - 1709
Zhurnal Neorganicheskoi Khimii, 1970 , vol. 15, p. 3274 - 3278
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Gmelin Handbook: Nb: MVol.B4, 11.7.6, page 261 - 263