Varma; Sreenivasmurthyachar
Journal of the Indian Chemical Society, 1936 , vol. 13, p. 187
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Mascarelli; Longo
Gazzetta Chimica Italiana, 1941 , vol. 71, p. 297,299
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Varma; Raman
Journal of the Indian Chemical Society, 1935 , vol. 12, p. 343