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Fierz-David; Sponagel
Helvetica Chimica Acta, 1943 , vol. 26, p. 98,105
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Fichter; Pluess
Patent: DE558468 , 1930 ;
Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 19, p. 767
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Fichter; Pluess
Helvetica Chimica Acta, 1932 , vol. 15, p. 236,243