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Baumgarten, P.; Bruns, W.
Ber. Dtsch. Chem. Ges., 1941 , vol. 74, p. 1232 - 1236
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Goubeau, J.; Keller, H.
Zeitschrift fuer Anorganische und Allgemeine Chemie, 1953 , vol. 272, p. 303 - 312
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Gmelin Handbook: B: B-Verb.13, 4.4, page 145 - 150

Lee, G. H.; Porter, R. F.
Inorganic Chemistry, 1966 , vol. 5, p. 1329 - 1333