Vittenet
Bulletin de la Societe Chimique de France, 1899 , vol. <3>21, p. 303
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Thomson; Wilson
Journal of the Chemical Society, 1933 , p. 1262
Journal of the Chemical Society, 1935 , p. 111
Sah
Journal of the Chinese Chemical Society (Peking), 1946 , vol. 13, p. 22,26,27
Recueil des Travaux Chimiques des Pays-Bas, 1940 , vol. 59, p. 231,233,234