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Backer; Beute
Recueil des Travaux Chimiques des Pays-Bas, 1935 , vol. 54, p. 168
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Union Carbide and Carbon Res. Labor.
Patent: US2205885 , 1938 ;
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du Pont de Nemours and Co.
Patent: US2171868 , 1936 ;
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Owen; Sultanbawa
Journal of the Chemical Society, 1949 , p. 3112