v. Braun; Kuehn; Goll
Chemische Berichte, 1926 , vol. 59, p. 2337

v. Braun; Zobel
Justus Liebigs Annalen der Chemie, 1925 , vol. 445, p. 265
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v. Braun; Blessing; Zobel
Chemische Berichte, 1924 , vol. 57, p. 190

Blicke; Hotelling
Journal of the American Chemical Society, 1954 , vol. 76, p. 5099,5100

v.Braun
Chemische Berichte, 1937 , vol. 70, p. 983