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Beckurts; Otto
Chemische Berichte, 1878 , vol. 11, p. 2066
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Noelting
Chemische Berichte, 1875 , vol. 8, p. 595
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Armstrong
Journal of the Chemical Society, 1871 , vol. 24, p. 174
Chemische Berichte, 1882 , vol. 15, p. 205