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Claisen; Haase
Chemische Berichte, 1900 , vol. 33, p. 3781
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Claisen
Chemische Berichte, 1896 , vol. 29, p. 2932
Chemische Berichte, 1898 , vol. 31, p. 1020
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Lauer; Spielman
Journal of the American Chemical Society, 1933 , vol. 55, p. 4923,4927