Crossley; Northey; Hultquist
Journal of the American Chemical Society, 1938 , vol. 60, p. 2217,2219
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Winthrop Chem. Co.
Patent: US2270676 , 1937 ;

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I.G. Farbenind.
Patent: DE681685 , 1936 ;
Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 25, p. 380
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Marchant; Lucas; McClelland
Canadian Journal of Research, Section B: Chemical Sciences, 1942 , vol. 20, p. 5,7, 9