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Patent: DE840242 , 1950 ;
DRP/DRBP Org.Chem.
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Farbenfarb.Bayer
Patent: US2723268 , 1953 ;
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Farbenfarb.Bayer
Patent: DE904156 , 1952 ;
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Helvetica Chimica Acta, 1950 , vol. 33, p. 1437,1447
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Grewe et al.
Justus Liebigs Annalen der Chemie, 1949 , vol. 564, p. 161,192