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Helvetica Chimica Acta, 1938 , vol. 21, p. 1317,1322
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Kuwada; Miyasaka
Yakugaku Zasshi, 1937 , vol. 57, p. 459,463;dtsch.Ref.S.96
Chem. Zentralbl., 1937 , vol. 108, # II p. 1825
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Schering A.G.
Patent: DE657017 , 1935 ;
Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 24, p. 497