Mikhailov, B. M.; Bubnov, Yu. N.
Zhurnal Obshchei Khimii, 1966 , vol. 31, p. 531 - 534
Zhurnal Obshchei Khimii, 1966 , vol. 31, p. 577 - 582
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Gmelin Handbook: B: B-Verb.4, 4.9.1, page 161 - 165