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Merling
Chemische Berichte, 1892 , vol. 25, p. 3124
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Willstaetter
Justus Liebigs Annalen der Chemie, 1901 , vol. 317, p. 325
Chemische Berichte, 1897 , vol. 30, p. 724
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Willstaetter
Chemische Berichte, 1897 , vol. 30, p. 711,712
Chem. Zentralbl., 1898 , vol. 69, # I p. 228