参考文献
Carbide and Carbon Chem.Corp.
Patent: FR796156 , 1935 ;
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Carbide and Carbon Chem.Corp.
Patent: DE659879 , 1935 ;
Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 24, p. 76
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Union Carbide and Carbon Corp.
Patent: US2044468 , 1934 ;