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Kaufmann; Radosevic
Chemische Berichte, 1916 , vol. 49, p. 680,682
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Faillebin
Annales de Chimie (Cachan, France), 1925 , vol. <10> 4, p. 423,435

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Journal of the Indian Chemical Society, 1941 , vol. 18, p. 213,215

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