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Wheeler; Johns
American Chemical Journal, 1908 , vol. 40, p. 242
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Claisen; Haase
Justus Liebigs Annalen der Chemie, 1897 , vol. 297, p. 75
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Claisen
Chemische Berichte, 1893 , vol. 26, p. 2732
Chemische Berichte, 1896 , vol. 29, p. 1005,1006