van Alphen
Recueil des Travaux Chimiques des Pays-Bas, 1937 , vol. 56, p. 1007,1008
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Ward
Journal of the American Chemical Society, 1935 , vol. 57, p. 916
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McCombie; Purdie
Journal of the Chemical Society, 1935 , p. 1217
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Ludowieg
Bol. Soc. quim. PeruChem.Abstr., 1948 , vol. 14, p. 81
Bol. Soc. quim. PeruChem.Abstr., 1949 , p. 1005
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Hercules Powder Co.
Patent: US2072348 , 1934 ;