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Datta; Bhoumik
Journal of the American Chemical Society, 1921 , vol. 43, p. 311
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Nicolet; Ray
Journal of the American Chemical Society, 1927 , vol. 49, p. 1805
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Niyogy
Journal of the Indian Chemical Society, 1927 , vol. 4, p. 401
Chem. Zentralbl., 1928 , vol. 99, # I p. 490