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Warnat
Chemische Berichte, 1927 , vol. 60, p. 1121
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Barger; Scholz
Journal of the Chemical Society, 1933 , p. 614
Helvetica Chimica Acta, 1933 , vol. 16, p. 1343
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Witkop
Justus Liebigs Annalen der Chemie, 1944 , vol. 556, p. 103,113
