Japp; Klingemann
Chemische Berichte, 1888 , vol. 21, p. 2933
Journal of the Chemical Society, 1890 , vol. 57, p. 674
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Knoevenagel; Weissgerber
Chemische Berichte, 1893 , vol. 26, p. 443
Klingemann
Chemische Berichte, 1893 , vol. 26, p. 818
Justus Liebigs Annalen der Chemie, 1893 , vol. 275, p. 67
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Stobbe; Niedenzu
Chemische Berichte, 1901 , vol. 34, p. 3898