Welenkiwar,S.S. et al.
Indian Journal of Chemistry, 1970 , vol. 8, p. 379 - 383

Welenkiwar,S.S. et al.
Indian Journal of Chemistry, 1970 , vol. 8, p. 379 - 383

Oestling
Journal of the Chemical Society, 1912 , vol. 101, p. 474
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Oestling
Oef. Fi., vol. 57, p. Abt. A, Nr. 7, S. 10
Chem. Zentralbl., 1921 , vol. 92, # III p. 105