Fischer
Patent: DE661506 , 1935 ;
Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 25, p. 497
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Fischer; Dangschat
Helvetica Chimica Acta, 1934 , vol. 17, p. 1200,1201
Helvetica Chimica Acta, 1935 , vol. 18, p. 1206,1207