Morozov, I. S.; Simonich, A. T.
Zhurnal Neorganicheskoi Khimii, 1957 , vol. 2, # 8 p. 311 - 321
Zhurnal Neorganicheskoi Khimii, 1957 , vol. 2, p. 1906 - 1914
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Gmelin Handbook: Ta: MVol.B2, 130, page 296 - 299