Ellinger
Chemische Berichte, 1906 , vol. 39, p. 2520
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Hopkins; Cole
J. Physiology, 1903 , vol. 29, p. 464
Chem. Zentralbl., 1903 , vol. 74, # II p. 1012
Perkin; Robinson
Journal of the Chemical Society, 1919 , vol. 115, p. 939
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Hopkins; Cole
J. Physiology, 1903 , vol. 29, p. 464
Chem. Zentralbl., 1903 , vol. 74, # II p. 1012